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: Julien Cristau <jcristau@debian.org> (cherry picked from commit b95f25af) (cherry picked from commit a510fb81) (cherry picked from commit 268c56c197b2cba46347e85312b601250d93f969)
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eefabdee
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