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expat.26587
expat-CVE-2022-23990.patch
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File expat-CVE-2022-23990.patch of Package expat.26587
From ede41d1e186ed2aba88a06e84cac839b770af3a1 Mon Sep 17 00:00:00 2001 From: Sebastian Pipping <sebastian@pipping.org> Date: Wed, 26 Jan 2022 02:36:43 +0100 Subject: [PATCH] lib: Prevent integer overflow in doProlog (CVE-2022-23990) The change from "int nameLen" to "size_t nameLen" addresses the overflow on "nameLen++" in code "for (; name[nameLen++];)" right above the second change in the patch. --- expat/lib/xmlparse.c | 10 ++++++++-- 1 file changed, 8 insertions(+), 2 deletions(-) Index: expat-2.2.5/lib/xmlparse.c =================================================================== --- expat-2.2.5.orig/lib/xmlparse.c +++ expat-2.2.5/lib/xmlparse.c @@ -5328,7 +5328,7 @@ doProlog(XML_Parser parser, if (dtd->in_eldecl) { ELEMENT_TYPE *el; const XML_Char *name; - int nameLen; + size_t nameLen; const char *nxt = (quant == XML_CQUANT_NONE ? next : next - enc->minBytesPerChar); @@ -5344,7 +5344,13 @@ doProlog(XML_Parser parser, dtd->scaffold[myindex].name = name; nameLen = 0; for (; name[nameLen++]; ); - dtd->contentStringLen += nameLen; + + /* Detect and prevent integer overflow */ + if (nameLen > UINT_MAX - dtd->contentStringLen) { + return XML_ERROR_NO_MEMORY; + } + + dtd->contentStringLen += (unsigned)nameLen; if (parser->m_elementDeclHandler) handleDefault = XML_FALSE; }
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