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