The patch below does not apply to the 5.4-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to stable@vger.kernel.org.

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From b537916ca5107c3a8714b8ab3099c0ec205aec12 Mon Sep 17 00:00:00 2001

From: Jens Axboe axboe@kernel.dk Date: Sun, 9 Feb 2020 11:29:15 -0700 Subject: [PATCH] io_uring: retain sockaddr_storage across send/recvmsg async punt

Jonas reports that he sometimes sees -97/-22 error returns from sendmsg, if it gets punted async. This is due to not retaining the sockaddr_storage between calls. Include that in the state we copy when going async.

Cc: stable@vger.kernel.org # 5.3+ Reported-by: Jonas Bonn jonas@norrbonn.se Tested-by: Jonas Bonn jonas@norrbonn.se Signed-off-by: Jens Axboe axboe@kernel.dk

diff --git a/fs/io_uring.c b/fs/io_uring.c index 971d51c50151..6d4e20d59729 100644 --- a/fs/io_uring.c +++ b/fs/io_uring.c @@ -442,6 +442,7 @@ struct io_async_msghdr { struct iovec *iov; struct sockaddr __user *uaddr; struct msghdr msg; + struct sockaddr_storage addr; };

struct io_async_rw { @@ -3032,12 +3033,11 @@ static int io_sendmsg(struct io_kiocb *req, struct io_kiocb **nxt, sock = sock_from_file(req->file, &ret); if (sock) { struct io_async_ctx io; - struct sockaddr_storage addr; unsigned flags;

if (req->io) { kmsg = &req->io->msg; - kmsg->msg.msg_name = &addr; + kmsg->msg.msg_name = &req->io->msg.addr; /* if iov is set, it's allocated already */ if (!kmsg->iov) kmsg->iov = kmsg->fast_iov; @@ -3046,7 +3046,7 @@ static int io_sendmsg(struct io_kiocb *req, struct io_kiocb **nxt, struct io_sr_msg *sr = &req->sr_msg;

kmsg = &io.msg; - kmsg->msg.msg_name = &addr; + kmsg->msg.msg_name = &io.msg.addr;

io.msg.iov = io.msg.fast_iov; ret = sendmsg_copy_msghdr(&io.msg.msg, sr->msg, @@ -3185,12 +3185,11 @@ static int io_recvmsg(struct io_kiocb *req, struct io_kiocb **nxt, sock = sock_from_file(req->file, &ret); if (sock) { struct io_async_ctx io; - struct sockaddr_storage addr; unsigned flags;

if (req->io) { kmsg = &req->io->msg; - kmsg->msg.msg_name = &addr; + kmsg->msg.msg_name = &req->io->msg.addr; /* if iov is set, it's allocated already */ if (!kmsg->iov) kmsg->iov = kmsg->fast_iov; @@ -3199,7 +3198,7 @@ static int io_recvmsg(struct io_kiocb *req, struct io_kiocb **nxt, struct io_sr_msg *sr = &req->sr_msg;

kmsg = &io.msg; - kmsg->msg.msg_name = &addr; + kmsg->msg.msg_name = &io.msg.addr;

io.msg.iov = io.msg.fast_iov; ret = recvmsg_copy_msghdr(&io.msg.msg, sr->msg,