6.12-stable review patch. If anyone has any objections, please let me know.
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From: Pavel Begunkov asml.silence@gmail.com
[ Upstream commit ab3ea6eac5f45669b091309f592c4ea324003053 ]
Send zc only links ubuf_info for requests coming from the same context. There are some ambiguous syz reports, so let's check the assumption on notification completion.
Signed-off-by: Pavel Begunkov asml.silence@gmail.com Link: https://lore.kernel.org/r/fd527d8638203fe0f1c5ff06ff2e1d8fd68f831b.175517996... Signed-off-by: Jens Axboe axboe@kernel.dk Signed-off-by: Sasha Levin sashal@kernel.org --- io_uring/notif.c | 5 +++++ 1 file changed, 5 insertions(+)
diff --git a/io_uring/notif.c b/io_uring/notif.c index d4cf5a1328e63..f50964c7dab82 100644 --- a/io_uring/notif.c +++ b/io_uring/notif.c @@ -14,10 +14,15 @@ static const struct ubuf_info_ops io_ubuf_ops; static void io_notif_tw_complete(struct io_kiocb *notif, struct io_tw_state *ts) { struct io_notif_data *nd = io_notif_to_data(notif); + struct io_ring_ctx *ctx = notif->ctx; + + lockdep_assert_held(&ctx->uring_lock);
do { notif = cmd_to_io_kiocb(nd);
+ if (WARN_ON_ONCE(ctx != notif->ctx)) + return; lockdep_assert(refcount_read(&nd->uarg.refcnt) == 0);
if (unlikely(nd->zc_report) && (nd->zc_copied || !nd->zc_used))