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| author | Alan Coopersmith <alan.coopersmith@oracle.com> | 2013-03-10 00:22:14 -0800 |
|---|---|---|
| committer | Alan Coopersmith <alan.coopersmith@oracle.com> | 2013-05-23 08:13:26 -0700 |
| commit | ef82512288d8ca36ac0beeb289f158195b0a8cae (patch) | |
| tree | e479ca0ef85dada4c1a2b69902ea68c769ed1fbc | |
| parent | 17071c1c608247800b2ca03a35b1fcc9c4cabe6c (diff) | |
| download | xorg-lib-libXi-ef82512288d8ca36ac0beeb289f158195b0a8cae.tar.gz | |
Avoid integer overflow in XListInputDevices() [CVE-2013-1984 8/8]
If the length of the reply as reported by the Xserver is too long, it
could overflow the calculation for the size of the buffer to copy the
reply into, causing memory corruption.
Signed-off-by: Alan Coopersmith <alan.coopersmith@oracle.com>
Reviewed-by: Peter Hutterer <peter.hutterer@who-t.net>
| -rw-r--r-- | src/XListDev.c | 10 |
1 files changed, 6 insertions, 4 deletions
diff --git a/src/XListDev.c b/src/XListDev.c index 1fa4747..1c14b96 100644 --- a/src/XListDev.c +++ b/src/XListDev.c @@ -60,6 +60,7 @@ SOFTWARE. #include <X11/extensions/XInput.h> #include <X11/extensions/extutil.h> #include "XIint.h" +#include <limits.h> /* Calculate length field to a multiples of sizeof(XID). XIDs are typedefs * to ulong and thus may be 8 bytes on some platforms. This can trigger a @@ -179,7 +180,7 @@ XListInputDevices( XAnyClassPtr Any; char *nptr, *Nptr; int i; - long rlen; + unsigned long rlen; XExtDisplayInfo *info = XInput_find_display(dpy); LockDisplay(dpy); @@ -198,9 +199,10 @@ XListInputDevices( if ((*ndevices = rep.ndevices)) { /* at least 1 input device */ size = *ndevices * sizeof(XDeviceInfo); - rlen = rep.length << 2; /* multiply length by 4 */ - list = (xDeviceInfo *) Xmalloc(rlen); - slist = list; + if (rep.length < (INT_MAX >> 2)) { + rlen = rep.length << 2; /* multiply length by 4 */ + slist = list = Xmalloc(rlen); + } if (!slist) { _XEatDataWords(dpy, rep.length); UnlockDisplay(dpy); |