From 8fa677d2706d325d71dab91bf6e6512c05214e37 Mon Sep 17 00:00:00 2001 From: Eric Dumazet Date: Mon, 2 Nov 2015 07:50:07 -0800 Subject: [PATCH] net: avoid NULL deref in inet_ctl_sock_destroy() 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 Reported-by: Dmitry Vyukov Signed-off-by: David S. Miller --- 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 279f83591971..109e3ee9108c 100644 --- a/include/net/inet_common.h +++ b/include/net/inet_common.h @@ -41,7 +41,8 @@ int inet_recv_error(struct sock *sk, struct msghdr *msg, int len, static inline void inet_ctl_sock_destroy(struct sock *sk) { - sock_release(sk->sk_socket); + if (sk) + sock_release(sk->sk_socket); } #endif -- 2.20.1