diff options
| author | Oleg Nesterov | 2015-06-30 03:29:58 +0200 |
|---|---|---|
| committer | Ingo Molnar | 2015-08-03 12:21:28 +0200 |
| commit | d308b9f1e4412bcf583c82c4ca15ef97cb8b0e6f (patch) | |
| tree | 0cc6e212c9ae62ad62ed3845629287d91f98a398 | |
| parent | 9a301f22faac7fc2207ee49c1855a6b4ba9c5a52 (diff) | |
stop_machine: Remove cpu_stop_work's from list in cpu_stop_park()
cpu_stop_park() does cpu_stop_signal_done() but leaves the work on
stopper->works. The owner of this work can free/reuse this memory
right after that and corrupt the list, so if this CPU becomes online
again cpu_stopper_thread() will crash.
Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Tejun Heo <tj@kernel.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: dave@stgolabs.net
Cc: der.herr@hofr.at
Cc: paulmck@linux.vnet.ibm.com
Cc: riel@redhat.com
Cc: viro@ZenIV.linux.org.uk
Link: http://lkml.kernel.org/r/20150630012958.GA23944@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
| -rw-r--r-- | kernel/stop_machine.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/kernel/stop_machine.c b/kernel/stop_machine.c index 9a70defe9f1f..12484e5d5c88 100644 --- a/kernel/stop_machine.c +++ b/kernel/stop_machine.c @@ -462,13 +462,15 @@ static void cpu_stop_create(unsigned int cpu) static void cpu_stop_park(unsigned int cpu) { struct cpu_stopper *stopper = &per_cpu(cpu_stopper, cpu); - struct cpu_stop_work *work; + struct cpu_stop_work *work, *tmp; unsigned long flags; /* drain remaining works */ spin_lock_irqsave(&stopper->lock, flags); - list_for_each_entry(work, &stopper->works, list) + list_for_each_entry_safe(work, tmp, &stopper->works, list) { + list_del_init(&work->list); cpu_stop_signal_done(work->done, false); + } stopper->enabled = false; spin_unlock_irqrestore(&stopper->lock, flags); } |