31 lines
1.0 KiB
Diff
31 lines
1.0 KiB
Diff
From 9bf0f2c16ee86f644dd1432507edff94c08dc232 Mon Sep 17 00:00:00 2001
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From: Sebastian Pipping <sebastian@pipping.org>
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Date: Mon, 19 Aug 2024 22:37:16 +0200
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Subject: [PATCH] lib: Detect integer overflow in function nextScaffoldPart
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Reported by TaiYou
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---
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expat/lib/xmlparse.c | 9 +++++++++
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1 file changed, 9 insertions(+)
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diff --git a/expat/lib/xmlparse.c b/expat/lib/xmlparse.c
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index 91682c188..f737575ea 100644
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--- a/expat/lib/xmlparse.c
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+++ b/expat/lib/xmlparse.c
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@@ -7558,6 +7558,15 @@ nextScaffoldPart(XML_Parser parser) {
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int next;
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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 -1;
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+ }
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+#endif
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dtd->scaffIndex = (int *)MALLOC(parser, parser->m_groupSize * sizeof(int));
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if (! dtd->scaffIndex)
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return -1;
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