expat: patch for CVE-2015-1283 from Mozilla

This commit is contained in:
James Cook 2015-07-27 22:36:15 -07:00
parent 208bd8242d
commit fba4a95068
2 changed files with 79 additions and 0 deletions

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@ -0,0 +1,77 @@
Found at https://hg.mozilla.org/releases/mozilla-esr31/rev/2f3e78643f5c on 2015-07-27. Modified: replaced path parser/expat/lib/xmlparse.c with lib/xmlparse.c.
diff --git a/lib/xmlparse.c b/lib/xmlparse.c
--- a/lib/xmlparse.c
+++ b/lib/xmlparse.c
@@ -1646,29 +1646,40 @@ XML_ParseBuffer(XML_Parser parser, int l
XmlUpdatePosition(encoding, positionPtr, bufferPtr, &position);
positionPtr = bufferPtr;
return result;
}
void * XMLCALL
XML_GetBuffer(XML_Parser parser, int len)
{
+/* BEGIN MOZILLA CHANGE (sanity check len) */
+ if (len < 0) {
+ errorCode = XML_ERROR_NO_MEMORY;
+ return NULL;
+ }
+/* END MOZILLA CHANGE */
switch (ps_parsing) {
case XML_SUSPENDED:
errorCode = XML_ERROR_SUSPENDED;
return NULL;
case XML_FINISHED:
errorCode = XML_ERROR_FINISHED;
return NULL;
default: ;
}
if (len > bufferLim - bufferEnd) {
- /* FIXME avoid integer overflow */
int neededSize = len + (int)(bufferEnd - bufferPtr);
+/* BEGIN MOZILLA CHANGE (sanity check neededSize) */
+ if (neededSize < 0) {
+ errorCode = XML_ERROR_NO_MEMORY;
+ return NULL;
+ }
+/* END MOZILLA CHANGE */
#ifdef XML_CONTEXT_BYTES
int keep = (int)(bufferPtr - buffer);
if (keep > XML_CONTEXT_BYTES)
keep = XML_CONTEXT_BYTES;
neededSize += keep;
#endif /* defined XML_CONTEXT_BYTES */
if (neededSize <= bufferLim - buffer) {
@@ -1687,17 +1698,25 @@ XML_GetBuffer(XML_Parser parser, int len
}
else {
char *newBuf;
int bufferSize = (int)(bufferLim - bufferPtr);
if (bufferSize == 0)
bufferSize = INIT_BUFFER_SIZE;
do {
bufferSize *= 2;
- } while (bufferSize < neededSize);
+/* BEGIN MOZILLA CHANGE (prevent infinite loop on overflow) */
+ } while (bufferSize < neededSize && bufferSize > 0);
+/* END MOZILLA CHANGE */
+/* BEGIN MOZILLA CHANGE (sanity check bufferSize) */
+ if (bufferSize <= 0) {
+ errorCode = XML_ERROR_NO_MEMORY;
+ return NULL;
+ }
+/* END MOZILLA CHANGE */
newBuf = (char *)MALLOC(bufferSize);
if (newBuf == 0) {
errorCode = XML_ERROR_NO_MEMORY;
return NULL;
}
bufferLim = newBuf + bufferSize;
#ifdef XML_CONTEXT_BYTES
if (bufferPtr) {

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@ -8,6 +8,8 @@ stdenv.mkDerivation rec {
sha256 = "11pblz61zyxh68s5pdcbhc30ha1b2vfjd83aiwfg4vc15x3hadw2";
};
patches = [ ./CVE-2015-1283.patch ];
meta = with stdenv.lib; {
homepage = http://www.libexpat.org/;
description = "A stream-oriented XML parser library written in C";