[PATCH 2.6.32 37/38] [PATCH 37/38] net: avoid NULL deref in inet_ctl_sock_destroy()

[Willy Tarreau]

2.6.32-longterm review patch.  If anyone has any objections, please let me know.

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

[ 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@xxxxxxxxxx>
Reported-by: Dmitry Vyukov <dvyukov@xxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Ben Hutchings <ben@xxxxxxxxxxxxxxx>
(cherry picked from commit f79c83d6c41930362bc66fc71489e92975a2facf)

Signed-off-by: Willy Tarreau <w@xxxxxx>
---
 include/net/inet_common.h | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/include/net/inet_common.h b/include/net/inet_common.h
index 18c7732..1fb67ab 100644
--- a/include/net/inet_common.h
+++ b/include/net/inet_common.h
@@ -47,7 +47,8 @@ extern int			inet_ctl_sock_create(struct sock **sk,
 
 static inline void inet_ctl_sock_destroy(struct sock *sk)
 {
-	sk_release_kernel(sk);
+	if (sk)
+		sk_release_kernel(sk);
 }
 
 #endif
-- 
1.7.12.2.21.g234cd45.dirty



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