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Fix XChangeFeedbackControl() request underflow

Browse source 
CVE-2021-3472 / ZDI-CAN-1259

This vulnerability was discovered by:
Jan-Niklas Sohn working with Trend Micro Zero Day Initiative

Signed-off-by: Matthieu Herrb <matthieu@herrb.eu>
(cherry picked from commit 7aaf54a188)
This commit is contained in:
Matthieu Herrb 2021-04-13 15:55:41 +02:00 • committed by Michel Dänzer
parent 2a327e5860
commit 1e4bf85df1
1 changed files with 4 additions and 1 deletions
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5
Xi/chgfctl.c
View file

@ -464,8 +464,11 @@ ProcXChangeFeedbackControl(ClientPtr client)
break;
case StringFeedbackClass:
{
xStringFeedbackCtl *f = ((xStringFeedbackCtl *) &stuff[1]);
xStringFeedbackCtl *f;
REQUEST_AT_LEAST_EXTRA_SIZE(xChangeFeedbackControlReq,
sizeof(xStringFeedbackCtl));
f = ((xStringFeedbackCtl *) &stuff[1]);
if (client->swapped) {
if (len < bytes_to_int32(sizeof(xStringFeedbackCtl)))
return BadLength;