linux-kernel - [PATCH 3.2 51/52] net: avoid NULL deref in inet_ctl_sock

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Date:	Tue, 24 Nov 2015 22:33:59 +0000
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:	akpm@...ux-foundation.org, "Dmitry Vyukov" <dvyukov@...gle.com>,
	"Eric Dumazet" <edumazet@...gle.com>,
	"David S. Miller" <davem@...emloft.net>
Subject: [PATCH 3.2 51/52] net: avoid NULL deref in inet_ctl_sock_destroy()

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

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

From: Eric Dumazet <edumazet@...gle.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@...gle.com>
Reported-by: Dmitry Vyukov <dvyukov@...gle.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Ben Hutchings <ben@...adent.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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