From 3f8b2667f257c21a992bda33bfb919ee164a429c Mon Sep 17 00:00:00 2001 From: Paolo Abeni Date: Wed, 16 Dec 2020 12:48:33 +0100 Subject: [PATCH] mptcp: properly annotate nested lock MPTCP closes the subflows while holding the msk-level lock. While acquiring the subflow socket lock we need to use the correct nested annotation, or we can hit a lockdep splat at runtime. Reported-and-tested-by: Geliang Tang Fixes: e16163b6e2b7 ("mptcp: refactor shutdown and close") Signed-off-by: Paolo Abeni Reviewed-by: Mat Martineau Signed-off-by: Jakub Kicinski --- net/mptcp/protocol.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/net/mptcp/protocol.c b/net/mptcp/protocol.c index d24243a28fce..64c0c54c80e8 100644 --- a/net/mptcp/protocol.c +++ b/net/mptcp/protocol.c @@ -2119,7 +2119,7 @@ void __mptcp_close_ssk(struct sock *sk, struct sock *ssk, list_del(&subflow->node); - lock_sock(ssk); + lock_sock_nested(ssk, SINGLE_DEPTH_NESTING); /* if we are invoked by the msk cleanup code, the subflow is * already orphaned -- 2.11.0