io_uring: only assign io_uring_enter() SQPOLL error in actual error case

[ upstream commit 21f965221e7c42609521342403e8fb91b8b3e76e ]

If an SQPOLL based ring is newly created and an application issues an
io_uring_enter(2) system call on it, then we can return a spurious
-EOWNERDEAD error. This happens because there's nothing to submit, and
if the caller doesn't specify any other action, the initial error
assignment of -EOWNERDEAD never gets overwritten. This causes us to
return it directly, even if it isn't valid.

Move the error assignment into the actual failure case instead.

Cc: stable@vger.kernel.org
Fixes: d9d05217cb69 ("io_uring: stop SQPOLL submit on creator's death")
Reported-by: Sherlock Holo sherlockya@gmail.com
Link: https://github.com/axboe/liburing/issues/413
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/fs/io_uring.c b/fs/io_uring.c
index 762eae2440b5e42621ac3205cddabd34c5457075..108b0ed31c11ad41ad304fdabb114be3ee109f4b 100644 (file)
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -9078,9 +9078,10 @@ SYSCALL_DEFINE6(io_uring_enter, unsigned int, fd, u32, to_submit,
        if (ctx->flags & IORING_SETUP_SQPOLL) {
                io_cqring_overflow_flush(ctx, false, NULL, NULL);
 
-               ret = -EOWNERDEAD;
-               if (unlikely(ctx->sqo_dead))
+               if (unlikely(ctx->sqo_dead)) {
+                       ret = -EOWNERDEAD;
                        goto out;
+               }
                if (flags & IORING_ENTER_SQ_WAKEUP)
                        wake_up(&ctx->sq_data->wait);
                if (flags & IORING_ENTER_SQ_WAIT) {