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author | Kent Overstreet <kent.overstreet@gmail.com> | 2019-09-03 21:25:45 +0800 |
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committer | Jens Axboe <axboe@kernel.dk> | 2019-09-03 08:08:31 -0600 |
commit | a22a9602b88fabf10847f238ff81fde5f906fef7 (patch) | |
tree | cdda0a4f2abcfaf8627fec61a16de34e19a2223b /lib | |
parent | d66c9920c0cf984cf99cab5036fd5f3a1b7fba46 (diff) | |
download | linux-a22a9602b88fabf10847f238ff81fde5f906fef7.tar.bz2 |
closures: fix a race on wakeup from closure_sync
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>
Diffstat (limited to 'lib')
0 files changed, 0 insertions, 0 deletions