36 lines
1022 B
Diff
36 lines
1022 B
Diff
From d61e5369290c949e45491010f84297d4d1684aad Mon Sep 17 00:00:00 2001
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From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
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Date: Thu, 21 Sep 2017 14:42:04 +0200
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Subject: [PATCH 342/365] net: use trylock in icmp_sk
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The locking path can be recursive (same as for sk->sk_lock.slock) and
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therefore we need a trylock version for the locallock, too.
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Cc: stable-rt@vger.kernel.org
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Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
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Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
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---
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net/ipv4/icmp.c | 6 +++++-
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1 file changed, 5 insertions(+), 1 deletion(-)
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diff --git a/net/ipv4/icmp.c b/net/ipv4/icmp.c
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index c79ad4ba670a..59675d1d4006 100644
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--- a/net/ipv4/icmp.c
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+++ b/net/ipv4/icmp.c
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@@ -219,7 +219,11 @@ static inline struct sock *icmp_xmit_lock(struct net *net)
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local_bh_disable();
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- local_lock(icmp_sk_lock);
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+ if (!local_trylock(icmp_sk_lock)) {
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+ local_bh_enable();
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+ return NULL;
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+ }
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+
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sk = icmp_sk(net);
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if (unlikely(!spin_trylock(&sk->sk_lock.slock))) {
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--
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2.28.0
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