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https://git.in.rschanz.org/ryan77627/guix.git
synced 2024-12-28 15:22:18 -05:00
39 lines
1.3 KiB
Diff
39 lines
1.3 KiB
Diff
Follow-up upstream fix for CVE-2015-1283 to not rely on undefined
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behavior.
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Adapted from a patch from Debian (found in Debian package version
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2.1.0-6+deb8u2) to apply to upstream code:
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https://sources.debian.net/src/expat/2.1.0-6%2Bdeb8u2/debian/patches/CVE-2015-1283-refix.patch/
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---
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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 0f6f4cd..5c70c17 100644
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--- a/lib/xmlparse.c
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+++ b/lib/xmlparse.c
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@@ -1727,7 +1727,8 @@ 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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@@ -1759,7 +1760,8 @@ 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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2.8.3
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