3.16.7-ckt21 -stable review patch.  If anyone has any objections, please let me 
know.

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

From: Eric Dumazet <[email protected]>

commit 8fa677d2706d325d71dab91bf6e6512c05214e37 upstream.

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 <[email protected]>
Reported-by: Dmitry Vyukov <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
[ luis: backported to 3.16: adjusted context ]
Signed-off-by: Luis Henriques <[email protected]>
---
 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 fe7994c48b75..fd1da045dabc 100644
--- a/include/net/inet_common.h
+++ b/include/net/inet_common.h
@@ -40,7 +40,8 @@ int inet_ctl_sock_create(struct sock **sk, unsigned short 
family,
 
 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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