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io_uring: don't submit half-prepared drain request

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[ 3784.910888] BUG: kernel NULL pointer dereference, address: 0000000000000020
[ 3784.910904] RIP: 0010:__io_file_supports_nowait+0x5/0xc0
[ 3784.910926] Call Trace:
[ 3784.910928]  ? io_read+0x17c/0x480
[ 3784.910945]  io_issue_sqe+0xcb/0x1840
[ 3784.910953]  __io_queue_sqe+0x44/0x300
[ 3784.910959]  io_req_task_submit+0x27/0x70
[ 3784.910962]  tctx_task_work+0xeb/0x1d0
[ 3784.910966]  task_work_run+0x61/0xa0
[ 3784.910968]  io_run_task_work_sig+0x53/0xa0
[ 3784.910975]  __x64_sys_io_uring_enter+0x22/0x30
[ 3784.910977]  do_syscall_64+0x3d/0x90
[ 3784.910981]  entry_SYSCALL_64_after_hwframe+0x44/0xae

io_drain_req() goes before checks for REQ_F_FAIL, which protect us from
submitting under-prepared request (e.g. failed in io_init_req(). Fail
such drained requests as well.

Fixes: a8295b982c ("io_uring: fix failed linkchain code logic")
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/e411eb9924d47a131b1e200b26b675df0c2b7627.1630415423.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Pavel Begunkov 2021-08-31 14:13:11 +01:00 committed by Jens Axboe
parent c6d3d9cbd6
commit b8ce1b9d25
1 changed files with 5 additions and 0 deletions
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5
fs/io_uring.c
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@ -6238,6 +6238,11 @@ static bool io_drain_req(struct io_kiocb *req)
int ret;
u32 seq;
if (req->flags & REQ_F_FAIL) {
io_req_complete_fail_submit(req);
return true;
}
/*
* If we need to drain a request in the middle of a link, drain the
* head request and the next request/link after the current link.