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Subject[PATCH 2.6.32 37/38] [PATCH 37/38] net: avoid NULL deref in inet_ctl_sock_destroy()
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@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>
(cherry picked from commit f79c83d6c41930362bc66fc71489e92975a2facf)

Signed-off-by: Willy Tarreau <w@1wt.eu>
---
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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