io_uring: fix io_drain_req()

io_drain_req() return whether the request has been consumed or not, not
an error code. Fix a stupid mistake slipped from optimisation patches.

Reported-by: syzbot+ba6fcd859210f4e9e109@syzkaller.appspotmail.com
Fixes: 76cc33d79175a ("io_uring: refactor io_req_defer()")
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/4d3c53c4274ffff307c8ae062fc7fda63b978df2.1626039606.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>

diff --git a/fs/io_uring.c b/fs/io_uring.c
index 1182152..0cac361 100644 (file)
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -6019,11 +6019,13 @@ static bool io_drain_req(struct io_kiocb *req)
 
        ret = io_req_prep_async(req);
        if (ret)
-               return ret;
+               goto fail;
        io_prep_async_link(req);
        de = kmalloc(sizeof(*de), GFP_KERNEL);
        if (!de) {
-               io_req_complete_failed(req, -ENOMEM);
+               ret = -ENOMEM;
+fail:
+               io_req_complete_failed(req, ret);
                return true;
        }