From d61e5369290c949e45491010f84297d4d1684aad Mon Sep 17 00:00:00 2001 From: Sebastian Andrzej Siewior Date: Thu, 21 Sep 2017 14:42:04 +0200 Subject: [PATCH 342/365] net: use trylock in icmp_sk The locking path can be recursive (same as for sk->sk_lock.slock) and therefore we need a trylock version for the locallock, too. Cc: stable-rt@vger.kernel.org Signed-off-by: Sebastian Andrzej Siewior Signed-off-by: Steven Rostedt (VMware) --- net/ipv4/icmp.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/net/ipv4/icmp.c b/net/ipv4/icmp.c index c79ad4ba670a..59675d1d4006 100644 --- a/net/ipv4/icmp.c +++ b/net/ipv4/icmp.c @@ -219,7 +219,11 @@ static inline struct sock *icmp_xmit_lock(struct net *net) local_bh_disable(); - local_lock(icmp_sk_lock); + if (!local_trylock(icmp_sk_lock)) { + local_bh_enable(); + return NULL; + } + sk = icmp_sk(net); if (unlikely(!spin_trylock(&sk->sk_lock.slock))) { -- 2.28.0