This is a note to let you know that I've just added the patch titled
io_uring/net: correctly handle multishot recvmsg retry setup
to the 6.6-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
io_uring-net-correctly-handle-multishot-recvmsg-retr.patch
and it can be found in the queue-6.6 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 6d287bffa0b7d6e6c748ffb91d62001ee7e47695
Author: Jens Axboe <axboe@xxxxxxxxx>
Date: Thu Mar 7 17:48:03 2024 -0700
io_uring/net: correctly handle multishot recvmsg retry setup
[ Upstream commit deaef31bc1ec7966698a427da8c161930830e1cf ]
If we loop for multishot receive on the initial attempt, and then abort
later on to wait for more, we miss a case where we should be copying the
io_async_msghdr from the stack to stable storage. This leads to the next
retry potentially failing, if the application had the msghdr on the
stack.
Cc: stable@xxxxxxxxxxxxxxx
Fixes: 9bb66906f23e ("io_uring: support multishot in recvmsg")
Signed-off-by: Jens Axboe <axboe@xxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/io_uring/net.c b/io_uring/net.c
index 4aaeada03f1e7..386a6745ae32f 100644
--- a/io_uring/net.c
+++ b/io_uring/net.c
@@ -915,7 +915,8 @@ int io_recvmsg(struct io_kiocb *req, unsigned int issue_flags)
kfree(kmsg->free_iov);
io_netmsg_recycle(req, issue_flags);
req->flags &= ~REQ_F_NEED_CLEANUP;
- }
+ } else if (ret == -EAGAIN)
+ return io_setup_async_msg(req, kmsg, issue_flags);
return ret;
}
