File expat-CVE-2022-25314-before.patch of Package expat

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File expat-CVE-2022-25314-before.patch of Package expat (Revision c13455f1a2b2f03e01eda51477f58b73)

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From 196bea60b1ef161d6a2957e6ddab00e2cb6c60ec Mon Sep 17 00:00:00 2001
From: Rhodri James <rhodri@kynesim.co.uk>
Date: Mon, 3 Jul 2017 17:47:00 +0100
Subject: [PATCH] Fix protocolEncodingName. (pull request #70)

Ensure that protocolEncodingName is always either NULL or points
to the correct encoding for the parser, even if the parser is
reset.
---
 expat/lib/xmlparse.c | 46 ++++++++++++++++++++++++++++++++++++++++----
 1 file changed, 42 insertions(+), 4 deletions(-)

Index: expat-2.1.0/lib/xmlparse.c
===================================================================
--- expat-2.1.0.orig/lib/xmlparse.c
+++ expat-2.1.0/lib/xmlparse.c
@@ -439,6 +439,9 @@ static ELEMENT_TYPE *
 getElementType(XML_Parser parser, const ENCODING *enc,
                const char *ptr, const char *end);
 
+static XML_Char *copyString(const XML_Char *s,
+                            const XML_Memory_Handling_Suite *memsuite);
+
 static unsigned long generate_hash_secret_salt(XML_Parser parser);
 static XML_Bool startParsing(XML_Parser parser);
 
@@ -848,6 +851,8 @@ parserCreate(const XML_Char *encodingNam
   nsAttsVersion = 0;
   nsAttsPower = 0;
 
+  protocolEncodingName = NULL;
+
   poolInit(&tempPool, &(parser->m_mem));
   poolInit(&temp2Pool, &(parser->m_mem));
   parserInit(parser, encodingName);
@@ -874,9 +879,9 @@ parserInit(XML_Parser parser, const XML_
 {
   processor = prologInitProcessor;
   XmlPrologStateInit(&prologState);
-  protocolEncodingName = (encodingName != NULL
-                          ? poolCopyString(&tempPool, encodingName)
-                          : NULL);
+  if (encodingName != NULL) {
+    protocolEncodingName = copyString(encodingName, &(parser->m_mem));
+  }
   curBase = NULL;
   XmlInitEncoding(&initEncoding, &encoding, 0);
   userData = NULL;
@@ -985,6 +990,8 @@ XML_ParserReset(XML_Parser parser, const
     unknownEncodingRelease(unknownEncodingData);
   poolClear(&tempPool);
   poolClear(&temp2Pool);
+  FREE((void *)protocolEncodingName);
+  protocolEncodingName = NULL;
   parserInit(parser, encodingName);
   dtdReset(_dtd, &parser->m_mem);
   return XML_TRUE;
@@ -999,10 +1006,16 @@ XML_SetEncoding(XML_Parser parser, const
   */
   if (ps_parsing == XML_PARSING || ps_parsing == XML_SUSPENDED)
     return XML_STATUS_ERROR;
+
+  /* Get rid of any previous encoding name */
+  FREE((void *)protocolEncodingName);
+
   if (encodingName == NULL)
+    /* No new encoding name */
     protocolEncodingName = NULL;
   else {
-    protocolEncodingName = poolCopyString(&tempPool, encodingName);
+    /* Copy the new encoding name into allocated memory */
+    protocolEncodingName = copyString(encodingName, &(parser->m_mem));
     if (!protocolEncodingName)
       return XML_STATUS_ERROR;
   }
@@ -1200,6 +1213,7 @@ XML_ParserFree(XML_Parser parser)
   destroyBindings(inheritedBindings, parser);
   poolDestroy(&tempPool);
   poolDestroy(&temp2Pool);
+  FREE((void *)protocolEncodingName);
 #ifdef XML_DTD
   /* external parameter entity parsers share the DTD structure
      parser->m_dtd with the root parser, so we must not destroy it
@@ -3583,6 +3597,7 @@ initializeEncoding(XML_Parser parser)
   const char *s;
 #ifdef XML_UNICODE
   char encodingBuf[128];
+  /* See comments abount `protoclEncodingName` in parserInit() */
   if (!protocolEncodingName)
     s = NULL;
   else {
@@ -6754,3 +6769,26 @@ getElementType(XML_Parser parser,
   }
   return ret;
 }
+
+static XML_Char *
+copyString(const XML_Char *s,
+           const XML_Memory_Handling_Suite *memsuite)
+{
+    int charsRequired = 0;
+    XML_Char *result;
+
+    /* First determine how long the string is */
+    while (s[charsRequired] != 0) {
+      charsRequired++;
+    }
+    /* Include the terminator */
+    charsRequired++;
+
+    /* Now allocate space for the copy */
+    result = memsuite->malloc_fcn(charsRequired * sizeof(XML_Char));
+    if (result == NULL)
+        return NULL;
+    /* Copy the original into place */
+    memcpy(result, s, charsRequired * sizeof(XML_Char));
+    return result;
+}

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