Messages in this thread | | | Date | Wed, 25 Dec 2013 21:52:49 +0000 | From | Chris Wilson <> | Subject | Re: [PATCH] drm/i915: Fix refcount leak and possible NULL pointer dereference. |
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On Tue, Dec 24, 2013 at 08:50:23PM +0900, Tetsuo Handa wrote: > >From 482be6384379072eb4c0d45d0ab8a25df4f59ed7 Mon Sep 17 00:00:00 2001 > From: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> > Date: Tue, 24 Dec 2013 18:04:14 +0900 > Subject: [PATCH] drm/i915: Fix refcount leak and possible NULL pointer dereference. > > Since get_pid_task() grabs a reference on the task_struct, we have to drop the > refcount after reading that task's comm name. Also, directly reading like > get_pid_task()->comm can trigger an oops when get_pid_task() returned NULL.
The second issue is moot as file itself cannot exist if the task_struct is NULL, and the task_struct cannot be destroyed until we finish the function. The simpler fix would appear to be s/get_pid_task/pid_task/ -Chris
-- Chris Wilson, Intel Open Source Technology Centre
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