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Description: drm/i915: Fix use-after-free when destroying GEM context
References:
https://lore.kernel.org/stable/20200114183937.12224-1-tyhicks@canonical.com/
https://bugzilla.suse.com/show_bug.cgi?id=1160966
Notes:
carnil> Issue was (differently) fixed in mainline by commit
carnil> 7dc40713618c ("drm/i915: Introduce a mutex for file_priv-
carnil> >context_idr") as part of a more complex patch which is part of
carnil> 5.2-rc1. There is a proposed simplified fix by Tyler Hicks for
carnil> 4.19.y, 4.14.y.
carnil> Introduced in 1acfc104cdf8 ("drm/i915: Enable rcu-only context
carnil> lookups") in 4.14-rc1.
Bugs:
upstream: released (5.2-rc1) [7dc40713618c884bf07c030d1ab1f47a9dc1f310]
4.19-upstream-stable: released (4.19.97) [afb89cd5f2ba2d5d04b85b2692a9a3d86b6fabd7]
4.9-upstream-stable: N/A "Vulnerable code introduced later"
3.16-upstream-stable: N/A "Vulnerable code introduced later"
sid: released (5.2.6-1)
4.19-buster-security: released (4.19.98-1)
4.9-stretch-security: N/A "Vulnerable code introduced later"
3.16-jessie-security: N/A "Vulnerable code introduced later"
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