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/openbmc/linux/drivers/gpu/drm/i915/ |
H A D | i915_trace.h | 9297ebf2 Tue Mar 18 10:27:37 CDT 2014 Steven Rostedt <rostedt@goodmis.org> drm/i915: Do not dereference pointers from ring buffer in evict event
The TP_printk() should never dereference any pointers, because the ring buffer can be read at some unknown time in the future. If a device no longer exists, it can cause a kernel oops. This also makes this event useless when saving the ring buffer in userspaces tools such as perf and trace-cmd.
The i915_gem_evict_vm dereferences the vm pointer which may also not exist when the ring buffer is read sometime in the future.
Link: http://lkml.kernel.org/r/1395095198-20034-3-git-send-email-artagnon@gmail.com Reported-by: Ramkumar Ramachandra <artagnon@gmail.com> Cc: stable@vger.kernel.org # 3.13+ Fixes: bcccff847d1f "drm/i915: trace vm eviction instead of everything" Signed-off-by: Steven Rostedt <rostedt@goodmis.org> [danvet: Try to make it actually compile] Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch> 9297ebf2 Tue Mar 18 10:27:37 CDT 2014 Steven Rostedt <rostedt@goodmis.org> drm/i915: Do not dereference pointers from ring buffer in evict event The TP_printk() should never dereference any pointers, because the ring buffer can be read at some unknown time in the future. If a device no longer exists, it can cause a kernel oops. This also makes this event useless when saving the ring buffer in userspaces tools such as perf and trace-cmd. The i915_gem_evict_vm dereferences the vm pointer which may also not exist when the ring buffer is read sometime in the future. Link: http://lkml.kernel.org/r/1395095198-20034-3-git-send-email-artagnon@gmail.com Reported-by: Ramkumar Ramachandra <artagnon@gmail.com> Cc: stable@vger.kernel.org # 3.13+ Fixes: bcccff847d1f "drm/i915: trace vm eviction instead of everything" Signed-off-by: Steven Rostedt <rostedt@goodmis.org> [danvet: Try to make it actually compile] Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
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