diff options
| author | Jens Axboe <axboe@kernel.dk> | 2023-01-08 20:39:17 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2023-01-18 13:58:33 +0300 |
| commit | e62e6258ab140b55bbef1f0d288263b75e2f0c20 (patch) | |
| tree | 238f16d533d2946bc115273dcb32c69b3b1ba0e9 /io_uring/io-wq.c | |
| parent | 0a14c3ded80c7dd399e68f361ee3338b5271c98e (diff) | |
| download | linux-e62e6258ab140b55bbef1f0d288263b75e2f0c20.tar.xz | |
io_uring/io-wq: only free worker if it was allocated for creation
commit e6db6f9398dadcbc06318a133d4c44a2d3844e61 upstream.
We have two types of task_work based creation, one is using an existing
worker to setup a new one (eg when going to sleep and we have no free
workers), and the other is allocating a new worker. Only the latter
should be freed when we cancel task_work creation for a new worker.
Fixes: af82425c6a2d ("io_uring/io-wq: free worker if task_work creation is canceled")
Reported-by: syzbot+d56ec896af3637bdb7e4@syzkaller.appspotmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'io_uring/io-wq.c')
| -rw-r--r-- | io_uring/io-wq.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/io_uring/io-wq.c b/io_uring/io-wq.c index 992dcd9f8c4c..411bb2d1acd4 100644 --- a/io_uring/io-wq.c +++ b/io_uring/io-wq.c @@ -1230,7 +1230,12 @@ static void io_wq_cancel_tw_create(struct io_wq *wq) worker = container_of(cb, struct io_worker, create_work); io_worker_cancel_cb(worker); - kfree(worker); + /* + * Only the worker continuation helper has worker allocated and + * hence needs freeing. + */ + if (cb->func == create_worker_cont) + kfree(worker); } } |