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| author | Alan Coopersmith <alan.coopersmith@oracle.com> | 2013-04-12 23:02:11 -0700 |
|---|---|---|
| committer | Alan Coopersmith <alan.coopersmith@oracle.com> | 2013-05-05 16:00:55 -0700 |
| commit | 786f78fd8df6d165ccbc81f306fd9f22b5c1551c (patch) | |
| tree | 9ed219c77ea8f7e07906c16de6e5886ab77e3194 | |
| parent | 9e577d40322b9e3d8bdefec0eefa44d8ead451a4 (diff) | |
| download | xorg-lib-libXrender-786f78fd8df6d165ccbc81f306fd9f22b5c1551c.tar.gz | |
integer overflow in XRenderQueryPictIndexValues() [CVE-2013-1987 3/3]
The length and numIndexValues members of the reply are both CARD32 and
need to be bounds checked before multiplying by sizeof (XIndexValue) to
avoid integer overflow leading to underallocation and writing data from
the network past the end of the allocated buffer.
Reported-by: Ilja Van Sprundel <ivansprundel@ioactive.com>
Signed-off-by: Alan Coopersmith <alan.coopersmith@oracle.com>
| -rw-r--r-- | src/Xrender.c | 25 |
1 files changed, 16 insertions, 9 deletions
diff --git a/src/Xrender.c b/src/Xrender.c index a62c753..3102eb2 100644 --- a/src/Xrender.c +++ b/src/Xrender.c @@ -844,7 +844,7 @@ XRenderQueryPictIndexValues(Display *dpy, xRenderQueryPictIndexValuesReq *req; xRenderQueryPictIndexValuesReply rep; XIndexValue *values; - int nbytes, nread, rlength, i; + unsigned int nbytes, nread, rlength, i; RenderCheckExtension (dpy, info, NULL); @@ -860,15 +860,22 @@ XRenderQueryPictIndexValues(Display *dpy, return NULL; } - /* request data length */ - nbytes = (long)rep.length << 2; - /* bytes of actual data in the request */ - nread = rep.numIndexValues * SIZEOF (xIndexValue); - /* size of array returned to application */ - rlength = rep.numIndexValues * sizeof (XIndexValue); + if ((rep.length < (INT_MAX >> 2)) && + (rep.numIndexValues < (INT_MAX / sizeof (XIndexValue)))) { + /* request data length */ + nbytes = rep.length << 2; + /* bytes of actual data in the request */ + nread = rep.numIndexValues * SIZEOF (xIndexValue); + /* size of array returned to application */ + rlength = rep.numIndexValues * sizeof (XIndexValue); + + /* allocate returned data */ + values = Xmalloc (rlength); + } else { + nbytes = nread = rlength = 0; + values = NULL; + } - /* allocate returned data */ - values = (XIndexValue *)Xmalloc (rlength); if (!values) { _XEatDataWords (dpy, rep.length); |