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| author | Pavel Begunkov <asml.silence@gmail.com> | 2019-10-25 12:31:31 +0300 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2019-10-25 09:02:01 -0600 |
| commit | 935d1e45908afb8853c497f2c2bbbb685dec51dc (patch) | |
| tree | 408e5c91fcd34aaa19d71fb4c672d89bf3e9c756 | |
| parent | fb5ccc98782f654778cb8d96ba8a998304f9a51f (diff) | |
| download | linux-935d1e45908afb8853c497f2c2bbbb685dec51dc.tar.bz2 | |
io_uring: Fix race for sqes with userspace
io_ring_submit() finalises with
1. io_commit_sqring(), which releases sqes to the userspace
2. Then calls to io_queue_link_head(), accessing released head's sqe
Reorder them.
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
| -rw-r--r-- | fs/io_uring.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/fs/io_uring.c b/fs/io_uring.c index 949c82a40d16..32f6598ecae9 100644 --- a/fs/io_uring.c +++ b/fs/io_uring.c @@ -2795,13 +2795,14 @@ out: submit++; io_submit_sqe(ctx, &s, statep, &link); } - io_commit_sqring(ctx); if (link) io_queue_link_head(ctx, link, &link->submit, shadow_req); if (statep) io_submit_state_end(statep); + io_commit_sqring(ctx); + return submit; } |