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| author | Kent Overstreet <kent.overstreet@gmail.com> | 2019-09-03 16:25:45 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-10-05 14:09:54 +0300 |
| commit | f0956418d9975fdc83343c12639edcb55310d27b (patch) | |
| tree | 80d9196d56e6595c648e007f68790d665991c96b /drivers/hwmon | |
| parent | 9fcfdff61f748e8ab151f9c62a208610e06505f4 (diff) | |
| download | linux-f0956418d9975fdc83343c12639edcb55310d27b.tar.xz | |
closures: fix a race on wakeup from closure_sync
[ Upstream commit a22a9602b88fabf10847f238ff81fde5f906fef7 ]
The race was when a thread using closure_sync() notices cl->s->done == 1
before the thread calling closure_put() calls wake_up_process(). Then,
it's possible for that thread to return and exit just before
wake_up_process() is called - so we're trying to wake up a process that
no longer exists.
rcu_read_lock() is sufficient to protect against this, as there's an rcu
barrier somewhere in the process teardown path.
Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>
Acked-by: Coly Li <colyli@suse.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'drivers/hwmon')
0 files changed, 0 insertions, 0 deletions