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Commit 98caf43e authored by Michal Srb's avatar Michal Srb Committed by Julien Cristau
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Xext/shm: Validate shmseg resource id (CVE-2017-13721)



Otherwise it can belong to a non-existing client and abort X server with
FatalError "client not in use", or overwrite existing segment of another
existing client.

Signed-off-by: default avatarJulien Cristau <jcristau@debian.org>
(cherry picked from commit b95f25af)
(cherry picked from commit a510fb81)
(cherry picked from commit 268c56c197b2cba46347e85312b601250d93f969)
parent eefabdee
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