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38 lines
1.3 KiB
Diff
38 lines
1.3 KiB
Diff
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From 29a11774d8ebbafe8418b4a5ffb4cc1160b194a1 Mon Sep 17 00:00:00 2001
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From: Pascal Cuoq <cuoq@trust-in-soft.com>
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Date: Sun, 15 May 2016 09:05:46 +0200
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Subject: [PATCH] Avoid relying on undefined behavior in CVE-2015-1283 fix. It
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does not really work: https://godbolt.org/g/Zl8gdF
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---
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expat/lib/xmlparse.c | 6 ++++--
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1 file changed, 4 insertions(+), 2 deletions(-)
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diff --git a/lib/xmlparse.c b/lib/xmlparse.c
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index 13e080d..cdb12ef 100644
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--- a/lib/xmlparse.c
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+++ b/lib/xmlparse.c
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@@ -1693,7 +1693,8 @@ XML_GetBuffer(XML_Parser parser, int len)
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}
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if (len > bufferLim - bufferEnd) {
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- int neededSize = len + (int)(bufferEnd - bufferPtr);
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+ /* Do not invoke signed arithmetic overflow: */
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+ int neededSize = (int) ((unsigned)len + (unsigned)(bufferEnd - bufferPtr));
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if (neededSize < 0) {
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errorCode = XML_ERROR_NO_MEMORY;
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return NULL;
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@@ -1725,7 +1726,8 @@ XML_GetBuffer(XML_Parser parser, int len)
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if (bufferSize == 0)
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bufferSize = INIT_BUFFER_SIZE;
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do {
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- bufferSize *= 2;
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+ /* Do not invoke signed arithmetic overflow: */
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+ bufferSize = (int) (2U * (unsigned) bufferSize);
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} while (bufferSize < neededSize && bufferSize > 0);
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if (bufferSize <= 0) {
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errorCode = XML_ERROR_NO_MEMORY;
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--
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2.8.2
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