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| author |   Pavel Begunkov <asml.silence@gmail.com> | 2021-01-11 04:00:30 +0000 |
|---|---|---|
| committer |   Jens Axboe <axboe@kernel.dk> | 2021-01-11 07:39:54 -0700 |
| commit | d434ab6db524ab1efd0afad4ffa1ee65ca6ac097 (patch) | |
| tree | 71234160cb83e0ba6b7ee49e36ae2cf32b3b903b /fs/io_uring.c | |
| parent | io_uring: stop SQPOLL submit on creator's death (diff) | |
| download | linux-dev-d434ab6db524ab1efd0afad4ffa1ee65ca6ac097.tar.xz linux-dev-d434ab6db524ab1efd0afad4ffa1ee65ca6ac097.zip | |
io_uring: drop mm and files after task_work_run
__io_req_task_submit() run by task_work can set mm and files, but
io_sq_thread() in some cases, and because __io_sq_thread_acquire_mm()
and __io_sq_thread_acquire_files() do a simple current->mm/files check
it may end up submitting IO with mm/files of another task.
We also need to drop it after in the end to drop potentially grabbed
references to them.
Cc: stable@vger.kernel.org # 5.9+
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'fs/io_uring.c')
| -rw-r--r-- | fs/io_uring.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/fs/io_uring.c b/fs/io_uring.c index 2f305c097bd5..7af74c1ec909 100644 --- a/fs/io_uring.c +++ b/fs/io_uring.c @@ -7056,6 +7056,7 @@ static int io_sq_thread(void *data) if (sqt_spin || !time_after(jiffies, timeout)) { io_run_task_work(); + io_sq_thread_drop_mm_files(); cond_resched(); if (sqt_spin) timeout = jiffies + sqd->sq_thread_idle; @@ -7093,6 +7094,7 @@ static int io_sq_thread(void *data) } io_run_task_work(); + io_sq_thread_drop_mm_files(); if (cur_css) io_sq_thread_unassociate_blkcg(); |