2024-09-04 12:40:55 -04:00
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From 0000000000000000000000000000000000000000 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 22:34:13 +0200
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2024-09-04 19:10:33 -04:00
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Subject: [PATCH] lib: Detect integer overflow in dtdCopy
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2024-09-04 12:40:55 -04:00
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Reported by TaiYou
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---
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lib/xmlparse.c | 10 ++++++++++
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1 file changed, 10 insertions(+)
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diff --git a/lib/xmlparse.c b/lib/xmlparse.c
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index f4e3d2a..a6d92f4 100644
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--- a/lib/xmlparse.c
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+++ b/lib/xmlparse.c
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@@ -6639,6 +6639,16 @@ dtdCopy(XML_Parser oldParser, DTD *newDtd, const DTD *oldDtd, const XML_Memory_H
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if (!newE)
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return 0;
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if (oldE->nDefaultAtts) {
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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(int) < sizeof(size_t), e.g. on x86_64. */
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+#if UINT_MAX >= SIZE_MAX
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+ if ((size_t)oldE->nDefaultAtts
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+ > ((size_t)(-1) / sizeof(DEFAULT_ATTRIBUTE))) {
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+ return 0;
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+ }
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+#endif
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newE->defaultAtts = (DEFAULT_ATTRIBUTE *)
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ms->malloc_fcn(oldE->nDefaultAtts * sizeof(DEFAULT_ATTRIBUTE));
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if (!newE->defaultAtts) {
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