From: Pavel Begunkov asml.silence@gmail.com
commit 6f10ae8a155446248055c7ddd480ef40139af788 upstream.
io_sendmsg_copy_hdr() may clear msg->msg_name if the userspace didn't provide it, we should retain NULL in this case.
Cc: stable@vger.kernel.org Signed-off-by: Pavel Begunkov asml.silence@gmail.com Link: https://lore.kernel.org/r/97d49f61b5ec76d0900df658cfde3aa59ff22121.166448654... Signed-off-by: Jens Axboe axboe@kernel.dk Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- io_uring/io_uring.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
--- a/io_uring/io_uring.c +++ b/io_uring/io_uring.c @@ -5850,7 +5850,8 @@ static int io_setup_async_msg(struct io_ async_msg = req->async_data; req->flags |= REQ_F_NEED_CLEANUP; memcpy(async_msg, kmsg, sizeof(*kmsg)); - async_msg->msg.msg_name = &async_msg->addr; + if (async_msg->msg.msg_name) + async_msg->msg.msg_name = &async_msg->addr; /* if were using fast_iov, set it to the new one */ if (!kmsg->free_iov) { size_t fast_idx = kmsg->msg.msg_iter.iov - kmsg->fast_iov;