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commit a1e59b20df897cca0c7d1939e247f5090981a173 Author: Peter Van der Beken peterv@propagandism.org AuthorDate: Wed Mar 2 22:22:08 2022 +0000
Bug 1754724 - Clear up some more computations in expat code. r=farre, a=tritter
Depends on D140165
Differential Revision: https://phabricator.services.mozilla.com/D140166 --- parser/expat/lib/xmlparse.c | 15 +++++++++++++++ 1 file changed, 15 insertions(+)
diff --git a/parser/expat/lib/xmlparse.c b/parser/expat/lib/xmlparse.c index 4584a9a1ee259..03c4dd7ff05de 100644 --- a/parser/expat/lib/xmlparse.c +++ b/parser/expat/lib/xmlparse.c @@ -5037,11 +5037,26 @@ doProlog(XML_Parser parser, case XML_ROLE_GROUP_OPEN: if (prologState.level >= groupSize) { if (groupSize) { + /* Detect and prevent integer overflow */ + if (parser->m_groupSize > (unsigned int)(-1) / 2u) { + return XML_ERROR_NO_MEMORY; + } + char *temp = (char *)REALLOC(groupConnector, groupSize *= 2); if (temp == NULL) return XML_ERROR_NO_MEMORY; groupConnector = temp; if (dtd->scaffIndex) { + /* 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 (parser->m_groupSize > (size_t)(-1) / sizeof(int)) { + return XML_ERROR_NO_MEMORY; + } +#endif + int *temp = (int *)REALLOC(dtd->scaffIndex, groupSize * sizeof(int)); if (temp == NULL)