Patch "mptcp: fix setsockopt(IP_TOS) subflow locking" has been added to the 6.5-stable tree

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This is a note to let you know that I've just added the patch titled

    mptcp: fix setsockopt(IP_TOS) subflow locking

to the 6.5-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:
     mptcp-fix-setsockopt-ip_tos-subflow-locking.patch
and it can be found in the queue-6.5 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.


>From 7679d34f97b7a09fd565f5729f79fd61b7c55329 Mon Sep 17 00:00:00 2001
From: Paolo Abeni <pabeni@xxxxxxxxxx>
Date: Tue, 14 Nov 2023 00:16:16 +0100
Subject: mptcp: fix setsockopt(IP_TOS) subflow locking

From: Paolo Abeni <pabeni@xxxxxxxxxx>

commit 7679d34f97b7a09fd565f5729f79fd61b7c55329 upstream.

The MPTCP implementation of the IP_TOS socket option uses the lockless
variant of the TOS manipulation helper and does not hold such lock at
the helper invocation time.

Add the required locking.

Fixes: ffcacff87cd6 ("mptcp: Support for IP_TOS for MPTCP setsockopt()")
Cc: stable@xxxxxxxxxxxxxxx
Closes: https://github.com/multipath-tcp/mptcp_net-next/issues/457
Signed-off-by: Paolo Abeni <pabeni@xxxxxxxxxx>
Reviewed-by: Mat Martineau <martineau@xxxxxxxxxx>
Signed-off-by: Matthieu Baerts <matttbe@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20231114-upstream-net-20231113-mptcp-misc-fixes-6-7-rc2-v1-4-7b9cd6a7b7f4@xxxxxxxxxx
Signed-off-by: Jakub Kicinski <kuba@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 net/mptcp/sockopt.c |    3 +++
 1 file changed, 3 insertions(+)

--- a/net/mptcp/sockopt.c
+++ b/net/mptcp/sockopt.c
@@ -737,8 +737,11 @@ static int mptcp_setsockopt_v4_set_tos(s
 	val = inet_sk(sk)->tos;
 	mptcp_for_each_subflow(msk, subflow) {
 		struct sock *ssk = mptcp_subflow_tcp_sock(subflow);
+		bool slow;
 
+		slow = lock_sock_fast(ssk);
 		__ip_sock_set_tos(ssk, val);
+		unlock_sock_fast(ssk, slow);
 	}
 	release_sock(sk);
 


Patches currently in stable-queue which might be from pabeni@xxxxxxxxxx are

queue-6.5/mptcp-deal-with-large-gso-size.patch
queue-6.5/atl1c-work-around-the-dma-rx-overflow-issue.patch
queue-6.5/net-sfp-add-quirk-for-fs-s-2.5g-copper-sfp.patch
queue-6.5/mptcp-fix-setsockopt-ip_tos-subflow-locking.patch
queue-6.5/net-sfp-add-quirk-for-fiberstone-gpon-onu-34-20bi.patch
queue-6.5/af_unix-fix-use-after-free-in-unix_stream_read_actor.patch
queue-6.5/net-dsa-lan9303-consequently-nested-lock-physical-mdio.patch
queue-6.5/net-ethtool-fix-documentation-of-ethtool_sprintf.patch
queue-6.5/net-sched-do-not-offload-flows-with-a-helper-in-act_.patch
queue-6.5/macvlan-don-t-propagate-promisc-change-to-lower-dev-.patch
queue-6.5/selftests-mptcp-fix-fastclose-with-csum-failure.patch



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