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commit 835df27bc1a1eae1ec51b14122ea40c974dd7409
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Author: Tomas Korbar <tkorbar@redhat.com>
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Date: Mon Feb 14 12:29:20 2022 +0100
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CVE-2021-46143
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diff --git a/lib/xmlparse.c b/lib/xmlparse.c
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index c45be0c..22d0a75 100644
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--- a/lib/xmlparse.c
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+++ b/lib/xmlparse.c
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@@ -4995,6 +4995,11 @@ doProlog(XML_Parser parser, const ENCODING *enc, const char *s, const char *end,
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case XML_ROLE_GROUP_OPEN:
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if (parser->m_prologState.level >= parser->m_groupSize) {
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if (parser->m_groupSize) {
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+ /* Detect and prevent integer overflow */
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+ if (parser->m_groupSize > (unsigned int)(-1) / 2u) {
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+ return XML_ERROR_NO_MEMORY;
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+ }
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+
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char *temp = (char *)REALLOC(parser, parser->m_groupConnector, parser->m_groupSize *= 2);
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if (temp == NULL) {
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parser->m_groupSize /= 2;
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@@ -5002,6 +5007,15 @@ doProlog(XML_Parser parser, const ENCODING *enc, const char *s, const char *end,
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}
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parser->m_groupConnector = temp;
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if (dtd->scaffIndex) {
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+ /* Detect and prevent integer overflow.
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+ * The preprocessor guard addresses the "always false" warning
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+ * from -Wtype-limits on platforms where
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+ * sizeof(unsigned int) < sizeof(size_t), e.g. on x86_64. */
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+#if UINT_MAX >= SIZE_MAX
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+ if (parser->m_groupSize > (size_t)(-1) / sizeof(int)) {
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+ return XML_ERROR_NO_MEMORY;
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+ }
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+#endif
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int *temp = (int *)REALLOC(parser, dtd->scaffIndex,
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parser->m_groupSize * sizeof(int));
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if (temp == NULL)
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