[PATCH 3.2 51/52] net: avoid NULL deref in inet_ctl_sock_destroy()

From	Ben Hutchings <ben@decadent.org.uk>
Newsgroups	linux.kernel
Subject	[PATCH 3.2 51/52] net: avoid NULL deref in inet_ctl_sock_destroy()
Date	2015-11-24 23:50 +0100
Message-ID	<qyuzo-5RA-19@gated-at.bofh.it> (permalink)
References	<qyupI-5Nu-5@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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3.2.74-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Eric Dumazet <edumazet@google.com>

[ Upstream commit 8fa677d2706d325d71dab91bf6e6512c05214e37 ]

Under low memory conditions, tcp_sk_init() and icmp_sk_init()
can both iterate on all possible cpus and call inet_ctl_sock_destroy(),
with eventual NULL pointer.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Reported-by: Dmitry Vyukov <dvyukov@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---
 include/net/inet_common.h | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/include/net/inet_common.h
+++ b/include/net/inet_common.h
@@ -38,7 +38,8 @@ extern int inet_ctl_sock_create(struct s
 
 static inline void inet_ctl_sock_destroy(struct sock *sk)
 {
-	sk_release_kernel(sk);
+	if (sk)
+		sk_release_kernel(sk);
 }
 
 #endif

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[PATCH 3.2 51/52] net: avoid NULL deref in inet_ctl_sock_destroy() Ben Hutchings <ben@decadent.org.uk> - 2015-11-24 23:50 +0100

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