File libxml2-CVE-2022-40303.patch of Package python-libxml2-python

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File libxml2-CVE-2022-40303.patch of Package python-libxml2-python (Revision ff889791535275e5beca83738157b2f8)

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From ffaec75809a315457891a0e54f8828bc6e056067 Mon Sep 17 00:00:00 2001
From: Nick Wellnhofer <wellnhofer@aevum.de>
Date: Thu, 25 Aug 2022 17:43:08 +0200
Subject: [PATCH] Fix integer overflows with XML_PARSE_HUGE

Also impose size limits when XML_PARSE_HUGE is set. Limit size of names
to XML_MAX_TEXT_LENGTH (10 million bytes) and other content to
XML_MAX_HUGE_LENGTH (1 billion bytes).

Move some the length checks to the end of the respective loop to make
them strict.

xmlParseEntityValue didn't have a length limitation at all. But without
XML_PARSE_HUGE, this should eventually trigger an error in xmlGROW.

Thanks to Maddie Stone working with Google Project Zero for the report!
---
 parser.c | 233 +++++++++++++++++++++++++++++--------------------------
 1 file changed, 121 insertions(+), 112 deletions(-)

Index: libxml2-2.9.7/parser.c
===================================================================
--- libxml2-2.9.7.orig/parser.c
+++ libxml2-2.9.7/parser.c
@@ -108,6 +108,8 @@ static void xmlHaltParser(xmlParserCtxtP
  *									*
  ************************************************************************/
 
+#define XML_MAX_HUGE_LENGTH 1000000000
+
 #define XML_PARSER_BIG_ENTITY 1000
 #define XML_PARSER_LOT_ENTITY 5000
 
@@ -555,7 +557,7 @@ xmlFatalErr(xmlParserCtxtPtr ctxt, xmlPa
             errmsg = "Malformed declaration expecting version";
             break;
         case XML_ERR_NAME_TOO_LONG:
-            errmsg = "Name too long use XML_PARSE_HUGE option";
+            errmsg = "Name too long";
             break;
 #if 0
         case:
@@ -3174,6 +3176,9 @@ xmlParseNameComplex(xmlParserCtxtPtr ctx
     int len = 0, l;
     int c;
     int count = 0;
+    int maxLength = (ctxt->options & XML_PARSE_HUGE) ?
+                    XML_MAX_TEXT_LENGTH :
+                    XML_MAX_NAME_LENGTH;
 
 #ifdef DEBUG
     nbParseNameComplex++;
@@ -3239,7 +3244,8 @@ xmlParseNameComplex(xmlParserCtxtPtr ctx
                 if (ctxt->instate == XML_PARSER_EOF)
                     return(NULL);
 	    }
-	    len += l;
+            if (len <= INT_MAX - l)
+	        len += l;
 	    NEXTL(l);
 	    c = CUR_CHAR(l);
 	}
@@ -3265,13 +3271,13 @@ xmlParseNameComplex(xmlParserCtxtPtr ctx
                 if (ctxt->instate == XML_PARSER_EOF)
                     return(NULL);
 	    }
-	    len += l;
+            if (len <= INT_MAX - l)
+	        len += l;
 	    NEXTL(l);
 	    c = CUR_CHAR(l);
 	}
     }
-    if ((len > XML_MAX_NAME_LENGTH) &&
-        ((ctxt->options & XML_PARSE_HUGE) == 0)) {
+    if (len > maxLength) {
         xmlFatalErr(ctxt, XML_ERR_NAME_TOO_LONG, "Name");
         return(NULL);
     }
@@ -3310,7 +3316,10 @@ const xmlChar *
 xmlParseName(xmlParserCtxtPtr ctxt) {
     const xmlChar *in;
     const xmlChar *ret;
-    int count = 0;
+    size_t count = 0;
+    size_t maxLength = (ctxt->options & XML_PARSE_HUGE) ?
+                       XML_MAX_TEXT_LENGTH :
+                       XML_MAX_NAME_LENGTH;
 
     GROW;
 
@@ -3334,8 +3343,7 @@ xmlParseName(xmlParserCtxtPtr ctxt) {
 	    in++;
 	if ((*in > 0) && (*in < 0x80)) {
 	    count = in - ctxt->input->cur;
-            if ((count > XML_MAX_NAME_LENGTH) &&
-                ((ctxt->options & XML_PARSE_HUGE) == 0)) {
+            if (count > maxLength) {
                 xmlFatalErr(ctxt, XML_ERR_NAME_TOO_LONG, "Name");
                 return(NULL);
             }
@@ -3357,6 +3365,9 @@ xmlParseNCNameComplex(xmlParserCtxtPtr c
     int len = 0, l;
     int c;
     int count = 0;
+    int maxLength = (ctxt->options & XML_PARSE_HUGE) ?
+                    XML_MAX_TEXT_LENGTH :
+                    XML_MAX_NAME_LENGTH;
     size_t startPosition = 0;
 
 #ifdef DEBUG
@@ -3377,17 +3388,13 @@ xmlParseNCNameComplex(xmlParserCtxtPtr c
     while ((c != ' ') && (c != '>') && (c != '/') && /* test bigname.xml */
 	   (xmlIsNameChar(ctxt, c) && (c != ':'))) {
 	if (count++ > XML_PARSER_CHUNK_SIZE) {
-            if ((len > XML_MAX_NAME_LENGTH) &&
-                ((ctxt->options & XML_PARSE_HUGE) == 0)) {
-                xmlFatalErr(ctxt, XML_ERR_NAME_TOO_LONG, "NCName");
-                return(NULL);
-            }
 	    count = 0;
 	    GROW;
             if (ctxt->instate == XML_PARSER_EOF)
                 return(NULL);
 	}
-	len += l;
+        if (len <= INT_MAX - l)
+	    len += l;
 	NEXTL(l);
 	c = CUR_CHAR(l);
 	if (c == 0) {
@@ -3405,8 +3412,7 @@ xmlParseNCNameComplex(xmlParserCtxtPtr c
 	    c = CUR_CHAR(l);
 	}
     }
-    if ((len > XML_MAX_NAME_LENGTH) &&
-        ((ctxt->options & XML_PARSE_HUGE) == 0)) {
+    if (len > maxLength) {
         xmlFatalErr(ctxt, XML_ERR_NAME_TOO_LONG, "NCName");
         return(NULL);
     }
@@ -3432,7 +3438,10 @@ static const xmlChar *
 xmlParseNCName(xmlParserCtxtPtr ctxt) {
     const xmlChar *in, *e;
     const xmlChar *ret;
-    int count = 0;
+    size_t count = 0;
+    size_t maxLength = (ctxt->options & XML_PARSE_HUGE) ?
+                       XML_MAX_TEXT_LENGTH :
+                       XML_MAX_NAME_LENGTH;
 
 #ifdef DEBUG
     nbParseNCName++;
@@ -3457,8 +3466,7 @@ xmlParseNCName(xmlParserCtxtPtr ctxt) {
 	    goto complex;
 	if ((*in > 0) && (*in < 0x80)) {
 	    count = in - ctxt->input->cur;
-            if ((count > XML_MAX_NAME_LENGTH) &&
-                ((ctxt->options & XML_PARSE_HUGE) == 0)) {
+            if (count > maxLength) {
                 xmlFatalErr(ctxt, XML_ERR_NAME_TOO_LONG, "NCName");
                 return(NULL);
             }
@@ -3541,6 +3549,9 @@ xmlParseStringName(xmlParserCtxtPtr ctxt
     const xmlChar *cur = *str;
     int len = 0, l;
     int c;
+    int maxLength = (ctxt->options & XML_PARSE_HUGE) ?
+                    XML_MAX_TEXT_LENGTH :
+                    XML_MAX_NAME_LENGTH;
 
 #ifdef DEBUG
     nbParseStringName++;
@@ -3576,12 +3587,6 @@ xmlParseStringName(xmlParserCtxtPtr ctxt
 		if (len + 10 > max) {
 		    xmlChar *tmp;
 
-                    if ((len > XML_MAX_NAME_LENGTH) &&
-                        ((ctxt->options & XML_PARSE_HUGE) == 0)) {
-                        xmlFatalErr(ctxt, XML_ERR_NAME_TOO_LONG, "NCName");
-			xmlFree(buffer);
-                        return(NULL);
-                    }
 		    max *= 2;
 		    tmp = (xmlChar *) xmlRealloc(buffer,
 			                            max * sizeof(xmlChar));
@@ -3595,14 +3600,18 @@ xmlParseStringName(xmlParserCtxtPtr ctxt
 		COPY_BUF(l,buffer,len,c);
 		cur += l;
 		c = CUR_SCHAR(cur, l);
+                if (len > maxLength) {
+                    xmlFatalErr(ctxt, XML_ERR_NAME_TOO_LONG, "NCName");
+                    xmlFree(buffer);
+                    return(NULL);
+                }
 	    }
 	    buffer[len] = 0;
 	    *str = cur;
 	    return(buffer);
 	}
     }
-    if ((len > XML_MAX_NAME_LENGTH) &&
-        ((ctxt->options & XML_PARSE_HUGE) == 0)) {
+    if (len > maxLength) {
         xmlFatalErr(ctxt, XML_ERR_NAME_TOO_LONG, "NCName");
         return(NULL);
     }
@@ -3629,6 +3638,9 @@ xmlParseNmtoken(xmlParserCtxtPtr ctxt) {
     int len = 0, l;
     int c;
     int count = 0;
+    int maxLength = (ctxt->options & XML_PARSE_HUGE) ?
+                    XML_MAX_TEXT_LENGTH :
+                    XML_MAX_NAME_LENGTH;
 
 #ifdef DEBUG
     nbParseNmToken++;
@@ -3680,12 +3692,6 @@ xmlParseNmtoken(xmlParserCtxtPtr ctxt) {
 		if (len + 10 > max) {
 		    xmlChar *tmp;
 
-                    if ((max > XML_MAX_NAME_LENGTH) &&
-                        ((ctxt->options & XML_PARSE_HUGE) == 0)) {
-                        xmlFatalErr(ctxt, XML_ERR_NAME_TOO_LONG, "NmToken");
-                        xmlFree(buffer);
-                        return(NULL);
-                    }
 		    max *= 2;
 		    tmp = (xmlChar *) xmlRealloc(buffer,
 			                            max * sizeof(xmlChar));
@@ -3699,6 +3705,11 @@ xmlParseNmtoken(xmlParserCtxtPtr ctxt) {
 		COPY_BUF(l,buffer,len,c);
 		NEXTL(l);
 		c = CUR_CHAR(l);
+                if (len > maxLength) {
+                    xmlFatalErr(ctxt, XML_ERR_NAME_TOO_LONG, "NmToken");
+                    xmlFree(buffer);
+                    return(NULL);
+                }
 	    }
 	    buffer[len] = 0;
 	    return(buffer);
@@ -3706,8 +3717,7 @@ xmlParseNmtoken(xmlParserCtxtPtr ctxt) {
     }
     if (len == 0)
         return(NULL);
-    if ((len > XML_MAX_NAME_LENGTH) &&
-        ((ctxt->options & XML_PARSE_HUGE) == 0)) {
+    if (len > maxLength) {
         xmlFatalErr(ctxt, XML_ERR_NAME_TOO_LONG, "NmToken");
         return(NULL);
     }
@@ -3733,6 +3743,9 @@ xmlParseEntityValue(xmlParserCtxtPtr ctx
     int len = 0;
     int size = XML_PARSER_BUFFER_SIZE;
     int c, l;
+    int maxLength = (ctxt->options & XML_PARSE_HUGE) ?
+                    XML_MAX_HUGE_LENGTH :
+                    XML_MAX_TEXT_LENGTH;
     xmlChar stop;
     xmlChar *ret = NULL;
     const xmlChar *cur = NULL;
@@ -3792,6 +3805,12 @@ xmlParseEntityValue(xmlParserCtxtPtr ctx
 	    GROW;
 	    c = CUR_CHAR(l);
 	}
+
+        if (len > maxLength) {
+            xmlFatalErrMsg(ctxt, XML_ERR_ENTITY_NOT_FINISHED,
+                           "entity value too long\n");
+            goto error;
+        }
     }
     buf[len] = 0;
     if (ctxt->instate == XML_PARSER_EOF)
@@ -3879,6 +3898,9 @@ xmlParseAttValueComplex(xmlParserCtxtPtr
     xmlChar *rep = NULL;
     size_t len = 0;
     size_t buf_size = 0;
+    size_t maxLength = (ctxt->options & XML_PARSE_HUGE) ?
+                       XML_MAX_HUGE_LENGTH :
+                       XML_MAX_TEXT_LENGTH;
     int c, l, in_space = 0;
     xmlChar *current = NULL;
     xmlEntityPtr ent;
@@ -3910,16 +3932,7 @@ xmlParseAttValueComplex(xmlParserCtxtPtr
     while (((NXT(0) != limit) && /* checked */
             (IS_CHAR(c)) && (c != '<')) &&
             (ctxt->instate != XML_PARSER_EOF)) {
-        /*
-         * Impose a reasonable limit on attribute size, unless XML_PARSE_HUGE
-         * special option is given
-         */
-        if ((len > XML_MAX_TEXT_LENGTH) &&
-            ((ctxt->options & XML_PARSE_HUGE) == 0)) {
-            xmlFatalErrMsg(ctxt, XML_ERR_ATTRIBUTE_NOT_FINISHED,
-                           "AttValue length too long\n");
-            goto mem_error;
-        }
+
 	if (c == 0) break;
 	if (c == '&') {
 	    in_space = 0;
@@ -4065,6 +4078,11 @@ xmlParseAttValueComplex(xmlParserCtxtPtr
 	}
 	GROW;
 	c = CUR_CHAR(l);
+        if (len > maxLength) {
+            xmlFatalErrMsg(ctxt, XML_ERR_ATTRIBUTE_NOT_FINISHED,
+                           "AttValue length too long\n");
+            goto mem_error;
+        }
     }
     if (ctxt->instate == XML_PARSER_EOF)
         goto error;
@@ -4085,17 +4103,7 @@ xmlParseAttValueComplex(xmlParserCtxtPtr
         }
     } else
 	NEXT;
-
-    /*
-     * There we potentially risk an overflow, don't allow attribute value of
-     * length more than INT_MAX it is a very reasonnable assumption !
-     */
-    if (len >= INT_MAX) {
-        xmlFatalErrMsg(ctxt, XML_ERR_ATTRIBUTE_NOT_FINISHED,
-                       "AttValue length too long\n");
-        goto mem_error;
-    }
-
+    
     if (attlen != NULL) *attlen = (int) len;
     return(buf);
 
@@ -4166,6 +4174,9 @@ xmlParseSystemLiteral(xmlParserCtxtPtr c
     int len = 0;
     int size = XML_PARSER_BUFFER_SIZE;
     int cur, l;
+    int maxLength = (ctxt->options & XML_PARSE_HUGE) ?
+                    XML_MAX_TEXT_LENGTH :
+                    XML_MAX_NAME_LENGTH;
     xmlChar stop;
     int state = ctxt->instate;
     int count = 0;
@@ -4193,13 +4204,6 @@ xmlParseSystemLiteral(xmlParserCtxtPtr c
 	if (len + 5 >= size) {
 	    xmlChar *tmp;
 
-            if ((size > XML_MAX_NAME_LENGTH) &&
-                ((ctxt->options & XML_PARSE_HUGE) == 0)) {
-                xmlFatalErr(ctxt, XML_ERR_NAME_TOO_LONG, "SystemLiteral");
-                xmlFree(buf);
-		ctxt->instate = (xmlParserInputState) state;
-                return(NULL);
-            }
 	    size *= 2;
 	    tmp = (xmlChar *) xmlRealloc(buf, size * sizeof(xmlChar));
 	    if (tmp == NULL) {
@@ -4227,6 +4231,12 @@ xmlParseSystemLiteral(xmlParserCtxtPtr c
 	    SHRINK;
 	    cur = CUR_CHAR(l);
 	}
+        if (len > maxLength) {
+            xmlFatalErr(ctxt, XML_ERR_NAME_TOO_LONG, "SystemLiteral");
+            xmlFree(buf);
+            ctxt->instate = (xmlParserInputState) state;
+            return(NULL);
+        }
     }
     buf[len] = 0;
     ctxt->instate = (xmlParserInputState) state;
@@ -4254,6 +4264,9 @@ xmlParsePubidLiteral(xmlParserCtxtPtr ct
     xmlChar *buf = NULL;
     int len = 0;
     int size = XML_PARSER_BUFFER_SIZE;
+    int maxLength = (ctxt->options & XML_PARSE_HUGE) ?
+                    XML_MAX_TEXT_LENGTH :
+                    XML_MAX_NAME_LENGTH;
     xmlChar cur;
     xmlChar stop;
     int count = 0;
@@ -4281,12 +4294,6 @@ xmlParsePubidLiteral(xmlParserCtxtPtr ct
 	if (len + 1 >= size) {
 	    xmlChar *tmp;
 
-            if ((size > XML_MAX_NAME_LENGTH) &&
-                ((ctxt->options & XML_PARSE_HUGE) == 0)) {
-                xmlFatalErr(ctxt, XML_ERR_NAME_TOO_LONG, "Public ID");
-                xmlFree(buf);
-                return(NULL);
-            }
 	    size *= 2;
 	    tmp = (xmlChar *) xmlRealloc(buf, size * sizeof(xmlChar));
 	    if (tmp == NULL) {
@@ -4313,6 +4320,11 @@ xmlParsePubidLiteral(xmlParserCtxtPtr ct
 	    SHRINK;
 	    cur = CUR;
 	}
+        if (len > maxLength) {
+            xmlFatalErr(ctxt, XML_ERR_NAME_TOO_LONG, "Public ID");
+            xmlFree(buf);
+            return(NULL);
+        }
     }
     buf[len] = 0;
     if (cur != stop) {
@@ -4710,6 +4722,9 @@ xmlParseCommentComplex(xmlParserCtxtPtr
     int r, rl;
     int cur, l;
     size_t count = 0;
+    size_t maxLength = (ctxt->options & XML_PARSE_HUGE) ?
+                       XML_MAX_HUGE_LENGTH :
+                       XML_MAX_TEXT_LENGTH;
     int inputid;
 
     inputid = ctxt->input->id;
@@ -4755,13 +4770,6 @@ xmlParseCommentComplex(xmlParserCtxtPtr
 	if ((r == '-') && (q == '-')) {
 	    xmlFatalErr(ctxt, XML_ERR_HYPHEN_IN_COMMENT, NULL);
 	}
-        if ((len > XML_MAX_TEXT_LENGTH) &&
-            ((ctxt->options & XML_PARSE_HUGE) == 0)) {
-            xmlFatalErrMsgStr(ctxt, XML_ERR_COMMENT_NOT_FINISHED,
-                         "Comment too big found", NULL);
-            xmlFree (buf);
-            return;
-        }
 	if (len + 5 >= size) {
 	    xmlChar *new_buf;
             size_t new_size;
@@ -4798,6 +4806,13 @@ xmlParseCommentComplex(xmlParserCtxtPtr
 	    GROW;
 	    cur = CUR_CHAR(l);
 	}
+
+        if (len > maxLength) {
+            xmlFatalErrMsgStr(ctxt, XML_ERR_COMMENT_NOT_FINISHED,
+                         "Comment too big found", NULL);
+            xmlFree (buf);
+            return;
+        }
     }
     buf[len] = 0;
     if (cur == 0) {
@@ -4842,6 +4857,9 @@ xmlParseComment(xmlParserCtxtPtr ctxt) {
     xmlChar *buf = NULL;
     size_t size = XML_PARSER_BUFFER_SIZE;
     size_t len = 0;
+    size_t maxLength = (ctxt->options & XML_PARSE_HUGE) ?
+                       XML_MAX_HUGE_LENGTH :
+                       XML_MAX_TEXT_LENGTH;
     xmlParserInputState state;
     const xmlChar *in;
     size_t nbchar = 0;
@@ -4925,8 +4943,7 @@ get_more:
 		buf[len] = 0;
 	    }
 	}
-        if ((len > XML_MAX_TEXT_LENGTH) &&
-            ((ctxt->options & XML_PARSE_HUGE) == 0)) {
+        if (len > maxLength) {
             xmlFatalErrMsgStr(ctxt, XML_ERR_COMMENT_NOT_FINISHED,
                          "Comment too big found", NULL);
             xmlFree (buf);
@@ -5122,6 +5139,9 @@ xmlParsePI(xmlParserCtxtPtr ctxt) {
     xmlChar *buf = NULL;
     size_t len = 0;
     size_t size = XML_PARSER_BUFFER_SIZE;
+    size_t maxLength = (ctxt->options & XML_PARSE_HUGE) ?
+                       XML_MAX_HUGE_LENGTH :
+                       XML_MAX_TEXT_LENGTH;
     int cur, l;
     const xmlChar *target;
     xmlParserInputState state;
@@ -5196,14 +5216,6 @@ xmlParsePI(xmlParserCtxtPtr ctxt) {
                         return;
                     }
 		    count = 0;
-                    if ((len > XML_MAX_TEXT_LENGTH) &&
-                        ((ctxt->options & XML_PARSE_HUGE) == 0)) {
-                        xmlFatalErrMsgStr(ctxt, XML_ERR_PI_NOT_FINISHED,
-                                          "PI %s too big found", target);
-                        xmlFree(buf);
-                        ctxt->instate = state;
-                        return;
-                    }
 		}
 		COPY_BUF(l,buf,len,cur);
 		NEXTL(l);
@@ -5213,15 +5225,14 @@ xmlParsePI(xmlParserCtxtPtr ctxt) {
 		    GROW;
 		    cur = CUR_CHAR(l);
 		}
+                if (len > maxLength) {
+                    xmlFatalErrMsgStr(ctxt, XML_ERR_PI_NOT_FINISHED,
+                                      "PI %s too big found", target);
+                    xmlFree(buf);
+                    ctxt->instate = state;
+                    return;
+                }
 	    }
-            if ((len > XML_MAX_TEXT_LENGTH) &&
-                ((ctxt->options & XML_PARSE_HUGE) == 0)) {
-                xmlFatalErrMsgStr(ctxt, XML_ERR_PI_NOT_FINISHED,
-                                  "PI %s too big found", target);
-                xmlFree(buf);
-                ctxt->instate = state;
-                return;
-            }
 	    buf[len] = 0;
 	    if (cur != '?') {
 		xmlFatalErrMsgStr(ctxt, XML_ERR_PI_NOT_FINISHED,
@@ -8885,6 +8896,9 @@ xmlParseAttValueInternal(xmlParserCtxtPt
     const xmlChar *in = NULL, *start, *end, *last;
     xmlChar *ret = NULL;
     int line, col;
+    int maxLength = (ctxt->options & XML_PARSE_HUGE) ?
+                    XML_MAX_HUGE_LENGTH :
+                    XML_MAX_TEXT_LENGTH;
 
     GROW;
     in = (xmlChar *) CUR_PTR;
@@ -8940,8 +8954,7 @@ xmlParseAttValueInternal(xmlParserCtxtPt
 		    in = in + delta;
 		}
 		end = ctxt->input->end;
-                if (((in - start) > XML_MAX_TEXT_LENGTH) &&
-                    ((ctxt->options & XML_PARSE_HUGE) == 0)) {
+                if ((in - start) > maxLength) {
                     xmlFatalErrMsg(ctxt, XML_ERR_ATTRIBUTE_NOT_FINISHED,
                                    "AttValue length too long\n");
                     return(NULL);
@@ -8963,8 +8976,7 @@ xmlParseAttValueInternal(xmlParserCtxtPt
 		    in = in + delta;
 		}
 		end = ctxt->input->end;
-                if (((in - start) > XML_MAX_TEXT_LENGTH) &&
-                    ((ctxt->options & XML_PARSE_HUGE) == 0)) {
+                if ((in - start) > maxLength) {
                     xmlFatalErrMsg(ctxt, XML_ERR_ATTRIBUTE_NOT_FINISHED,
                                    "AttValue length too long\n");
                     return(NULL);
@@ -8997,16 +9009,14 @@ xmlParseAttValueInternal(xmlParserCtxtPt
 		    last = last + delta;
 		}
 		end = ctxt->input->end;
-                if (((in - start) > XML_MAX_TEXT_LENGTH) &&
-                    ((ctxt->options & XML_PARSE_HUGE) == 0)) {
+                if ((in - start) > maxLength) {
                     xmlFatalErrMsg(ctxt, XML_ERR_ATTRIBUTE_NOT_FINISHED,
                                    "AttValue length too long\n");
                     return(NULL);
                 }
 	    }
 	}
-        if (((in - start) > XML_MAX_TEXT_LENGTH) &&
-            ((ctxt->options & XML_PARSE_HUGE) == 0)) {
+        if ((in - start) > maxLength) {
             xmlFatalErrMsg(ctxt, XML_ERR_ATTRIBUTE_NOT_FINISHED,
                            "AttValue length too long\n");
             return(NULL);
@@ -9028,8 +9038,7 @@ xmlParseAttValueInternal(xmlParserCtxtPt
 		    in = in + delta;
 		}
 		end = ctxt->input->end;
-                if (((in - start) > XML_MAX_TEXT_LENGTH) &&
-                    ((ctxt->options & XML_PARSE_HUGE) == 0)) {
+                if ((in - start) > maxLength) {
                     xmlFatalErrMsg(ctxt, XML_ERR_ATTRIBUTE_NOT_FINISHED,
                                    "AttValue length too long\n");
                     return(NULL);
@@ -9037,8 +9046,7 @@ xmlParseAttValueInternal(xmlParserCtxtPt
 	    }
 	}
 	last = in;
-        if (((in - start) > XML_MAX_TEXT_LENGTH) &&
-            ((ctxt->options & XML_PARSE_HUGE) == 0)) {
+        if ((in - start) > maxLength) {
             xmlFatalErrMsg(ctxt, XML_ERR_ATTRIBUTE_NOT_FINISHED,
                            "AttValue length too long\n");
             return(NULL);
@@ -9745,6 +9753,9 @@ xmlParseCDSect(xmlParserCtxtPtr ctxt) {
     int	s, sl;
     int cur, l;
     int count = 0;
+    int maxLength = (ctxt->options & XML_PARSE_HUGE) ?
+                    XML_MAX_HUGE_LENGTH :
+                    XML_MAX_TEXT_LENGTH;
 
     /* Check 2.6.0 was NXT(0) not RAW */
     if (CMP9(CUR_PTR, '<', '!', '[', 'C', 'D', 'A', 'T', 'A', '[')) {
@@ -9778,13 +9789,6 @@ xmlParseCDSect(xmlParserCtxtPtr ctxt) {
 	if (len + 5 >= size) {
 	    xmlChar *tmp;
 
-            if ((size > XML_MAX_TEXT_LENGTH) &&
-                ((ctxt->options & XML_PARSE_HUGE) == 0)) {
-                xmlFatalErrMsgStr(ctxt, XML_ERR_CDATA_NOT_FINISHED,
-                             "CData section too big found", NULL);
-                xmlFree (buf);
-                return;
-            }
 	    tmp = (xmlChar *) xmlRealloc(buf, size * 2 * sizeof(xmlChar));
 	    if (tmp == NULL) {
 	        xmlFree(buf);
@@ -9810,6 +9814,12 @@ xmlParseCDSect(xmlParserCtxtPtr ctxt) {
 	}
 	NEXTL(l);
 	cur = CUR_CHAR(l);
+        if (len > maxLength) {
+            xmlFatalErrMsg(ctxt, XML_ERR_CDATA_NOT_FINISHED,
+                           "CData section too big found\n");
+            xmlFree(buf);
+            return;
+        }
     }
     buf[len] = 0;
     ctxt->instate = XML_PARSER_CONTENT;

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File libxml2-CVE-2022-40303.patch of Package python-libxml2-python (Revision ff889791535275e5beca83738157b2f8)

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