From: Pavel Begunkov <asml.silence@xxxxxxxxx> 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@xxxxxxxxxxxxxxx Signed-off-by: Pavel Begunkov <asml.silence@xxxxxxxxx> Link: https://lore.kernel.org/r/97d49f61b5ec76d0900df658cfde3aa59ff22121.1664486545.git.asml.silence@xxxxxxxxx Signed-off-by: Jens Axboe <axboe@xxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- io_uring/net.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) --- a/io_uring/net.c +++ b/io_uring/net.c @@ -163,7 +163,8 @@ static int io_setup_async_msg(struct io_ } 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;
