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SUSE:SLE-15-SP1:GA
expat.26587
expat-CVE-2022-22827.patch
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File expat-CVE-2022-22827.patch of Package expat.26587
From 9f93e8036e842329863bf20395b8fb8f73834d9e Mon Sep 17 00:00:00 2001 From: Sebastian Pipping <sebastian@pipping.org> Date: Thu, 30 Dec 2021 22:46:03 +0100 Subject: [PATCH] lib: Prevent integer overflow at multiple places (CVE-2022-22822 to CVE-2022-22827) The involved functions are: - addBinding (CVE-2022-22822) - build_model (CVE-2022-22823) - defineAttribute (CVE-2022-22824) - lookup (CVE-2022-22825) - nextScaffoldPart (CVE-2022-22826) - storeAtts (CVE-2022-22827) --- expat/lib/xmlparse.c | 153 ++++++++++++++++++++++++++++++++++++++++++- 1 file changed, 151 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 @@ -3182,13 +3182,38 @@ storeAtts(XML_Parser parser, const ENCOD /* get the attributes from the tokenizer */ n = XmlGetAttributes(enc, attStr, parser->m_attsSize, parser->m_atts); + + /* Detect and prevent integer overflow */ + if (n > INT_MAX - nDefaultAtts) { + return XML_ERROR_NO_MEMORY; + } + if (n + nDefaultAtts > parser->m_attsSize) { int oldAttsSize = parser->m_attsSize; ATTRIBUTE *temp; #ifdef XML_ATTR_INFO XML_AttrInfo *temp2; #endif + + /* Detect and prevent integer overflow */ + if ((nDefaultAtts > INT_MAX - INIT_ATTS_SIZE) + || (n > INT_MAX - (nDefaultAtts + INIT_ATTS_SIZE))) { + return XML_ERROR_NO_MEMORY; + } + parser->m_attsSize = n + nDefaultAtts + INIT_ATTS_SIZE; + + /* Detect and prevent integer overflow. + * The preprocessor guard addresses the "always false" warning + * from -Wtype-limits on platforms where + * sizeof(unsigned int) < sizeof(size_t), e.g. on x86_64. */ +#if UINT_MAX >= SIZE_MAX + if ((unsigned)parser->m_attsSize > (size_t)(-1) / sizeof(ATTRIBUTE)) { + parser->m_attsSize = oldAttsSize; + return XML_ERROR_NO_MEMORY; + } +#endif + temp = (ATTRIBUTE *)REALLOC(parser, (void *)parser->m_atts, parser->m_attsSize * sizeof(ATTRIBUTE)); if (temp == NULL) { parser->m_attsSize = oldAttsSize; @@ -3196,6 +3221,18 @@ storeAtts(XML_Parser parser, const ENCOD } parser->m_atts = temp; #ifdef XML_ATTR_INFO + + /* Detect and prevent integer overflow. + * The preprocessor guard addresses the "always false" warning + * from -Wtype-limits on platforms where + * sizeof(unsigned int) < sizeof(size_t), e.g. on x86_64. */ +# if UINT_MAX >= SIZE_MAX + if ((unsigned)parser->m_attsSize > (size_t)(-1) / sizeof(XML_AttrInfo)) { + parser->m_attsSize = oldAttsSize; + return XML_ERROR_NO_MEMORY; + } +# endif + temp2 = (XML_AttrInfo *)REALLOC(parser, (void *)parser->m_attInfo, parser->m_attsSize * sizeof(XML_AttrInfo)); if (temp2 == NULL) { parser->m_attsSize = oldAttsSize; @@ -3531,9 +3568,31 @@ storeAtts(XML_Parser parser, const ENCOD tagNamePtr->prefixLen = prefixLen; for (i = 0; localPart[i++];) ; /* i includes null terminator */ + + /* Detect and prevent integer overflow */ + if (binding->uriLen > INT_MAX - prefixLen + || i > INT_MAX - (binding->uriLen + prefixLen)) { + return XML_ERROR_NO_MEMORY; + } + n = i + binding->uriLen + prefixLen; if (n > binding->uriAlloc) { TAG *p; + + /* Detect and prevent integer overflow */ + if (n > INT_MAX - EXPAND_SPARE) { + return XML_ERROR_NO_MEMORY; + } + /* Detect and prevent integer overflow. + * The preprocessor guard addresses the "always false" warning + * from -Wtype-limits on platforms where + * sizeof(unsigned int) < sizeof(size_t), e.g. on x86_64. */ +#if UINT_MAX >= SIZE_MAX + if ((unsigned)(n + EXPAND_SPARE) > (size_t)(-1) / sizeof(XML_Char)) { + return XML_ERROR_NO_MEMORY; + } +#endif + uri = (XML_Char *)MALLOC(parser, (n + EXPAND_SPARE) * sizeof(XML_Char)); if (!uri) return XML_ERROR_NO_MEMORY;
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