Commit ab3ea6ea authored by Pavel Begunkov's avatar Pavel Begunkov Committed by Jens Axboe
Browse files

io_uring/zctx: check chained notif contexts 



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: default avatarPavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/fd527d8638203fe0f1c5ff06ff2e1d8fd68f831b.1755179962.git.asml.silence@gmail.com


Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
parent 92a96b0a

io_uring/notif.c

+5 −0
Original line number Diff line number Diff line
@@ -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))