diff options
| author | Paolo Abeni <pabeni@redhat.com> | 2023-11-14 00:16:16 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2023-11-28 17:07:20 +0000 |
| commit | 9e9e2107ae3637ed143d87f86025b47ddb502060 (patch) | |
| tree | 474b2ffedac0802a67f6585cde66059b47d9970c /net | |
| parent | dba6f08cef1944116be7a480a4f8e51faca2a184 (diff) | |
| download | linux-stable-9e9e2107ae3637ed143d87f86025b47ddb502060.tar.gz linux-stable-9e9e2107ae3637ed143d87f86025b47ddb502060.tar.bz2 linux-stable-9e9e2107ae3637ed143d87f86025b47ddb502060.zip | |
mptcp: fix setsockopt(IP_TOS) subflow locking
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@vger.kernel.org
Closes: https://github.com/multipath-tcp/mptcp_net-next/issues/457
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Reviewed-by: Mat Martineau <martineau@kernel.org>
Signed-off-by: Matthieu Baerts <matttbe@kernel.org>
Link: https://lore.kernel.org/r/20231114-upstream-net-20231113-mptcp-misc-fixes-6-7-rc2-v1-4-7b9cd6a7b7f4@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'net')
| -rw-r--r-- | net/mptcp/sockopt.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/net/mptcp/sockopt.c b/net/mptcp/sockopt.c index 937bd4c55615..30374fd44228 100644 --- a/net/mptcp/sockopt.c +++ b/net/mptcp/sockopt.c @@ -735,8 +735,11 @@ static int mptcp_setsockopt_v4_set_tos(struct mptcp_sock *msk, int optname, 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); |