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| author | Sebastian Andrzej Siewior <bigeasy@linutronix.de> | 2015-02-17 16:43:43 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2015-03-18 14:11:05 +0100 |
| commit | 6221586c98cc3d1e3754c29df1206b6fe9f06394 (patch) | |
| tree | c2f9c5427dc33aa9bc177789bf00d7a7fc958036 /mm/mremap.c | |
| parent | 985defee8634240a01da504c81198a4d52aeb028 (diff) | |
locking/rtmutex: Avoid a NULL pointer dereference on deadlock
commit 8d1e5a1a1ccf5ae9d8a5a0ee7960202ccb0c5429 upstream.
With task_blocks_on_rt_mutex() returning early -EDEADLK we never
add the waiter to the waitqueue. Later, we try to remove it via
remove_waiter() and go boom in rt_mutex_top_waiter() because
rb_entry() gives a NULL pointer.
( Tested on v3.18-RT where rtmutex is used for regular mutex and I
tried to get one twice in a row. )
Not sure when this started but I guess 397335f004f4 ("rtmutex: Fix
deadlock detector for real") or commit 3d5c9340d194 ("rtmutex:
Handle deadlock detection smarter").
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Acked-by: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/1424187823-19600-1-git-send-email-bigeasy@linutronix.de
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'mm/mremap.c')
0 files changed, 0 insertions, 0 deletions