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 --- io_uring/notif.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/io_uring/notif.c b/io_uring/notif.c index 9a6f6e92d742..8c92e9cde2c6 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, io_tw_token_t tw) { 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)) -- 2.49.0