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Message-Id: <20151129214704.458612682@1wt.eu>
Date: Sun, 29 Nov 2015 22:47:39 +0100
From: Willy Tarreau <w@....eu>
To: linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc: Eric Dumazet <edumazet@...gle.com>,
Dmitry Vyukov <dvyukov@...gle.com>,
"David S. Miller" <davem@...emloft.net>,
Ben Hutchings <ben@...adent.org.uk>, Willy Tarreau <w@....eu>
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@...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>
(cherry picked from commit f79c83d6c41930362bc66fc71489e92975a2facf)
Signed-off-by: Willy Tarreau <w@....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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