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io_uring: fix ->work corruption with poll_add

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req->work might be already initialised by the time it gets into
__io_arm_poll_handler(), which will corrupt it by using fields that are
in an union with req->work. Luckily, the only side effect is missing
put_creds(). Clean req->work before going there.

Suggested-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Pavel Begunkov 2020-07-24 20:07:20 +03:00 committed by Jens Axboe
parent 3e863ea3bb
commit d5e16d8e23
1 changed files with 4 additions and 0 deletions
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4
fs/io_uring.c
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@ -4658,6 +4658,10 @@ static int io_poll_add(struct io_kiocb *req)
struct io_poll_table ipt;
__poll_t mask;
/* ->work is in union with hash_node and others */
io_req_work_drop_env(req);
req->flags &= ~REQ_F_WORK_INITIALIZED;
INIT_HLIST_NODE(&req->hash_node);
INIT_LIST_HEAD(&req->list);
ipt.pt._qproc = io_poll_queue_proc;