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Inorder to serialise the closing of the file descriptor and its subsequent release of client requests with i915_gem_free_request(), we need to hold the struct_mutex in i915_gem_release(). Failing to do so has the potential to trigger an OOPS, later with a use-after-free. Testcase: igt/gem_close_race Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=70874 Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=71029 Reported-by: Eric Anholt <eric@anholt.net> Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Cc: stable@vger.kernel.org Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch> |
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