linux-kernel - [PATCH] Fix: Dereference pointer-value of sk_prot->memory

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Message-ID: <87r4bbiwyh.fsf_-_@xmission.com>
Date:	Wed, 23 Oct 2013 12:55:18 -0700
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	Christoph Paasch <christoph.paasch@...ouvain.be>,
	fengguang.wu@...el.com, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, Eric Dumazet <eric.dumazet@...il.com>
Subject: [PATCH] Fix: Dereference pointer-value of sk_prot->memory_pressure

From: Christoph Paasch <christoph.paasch@...ouvain.be>
Date: Wed, 23 Oct 2013 12:49:21 -0700

2e685cad57 (tcp_memcontrol: Kill struct tcp_memcontrol) falsly modified
the access to memory_pressure of sk->sk_prot->memory_pressure. The patch
did modify the memory_pressure-field of struct cg_proto, but not the one
of struct proto.

So, the access to sk_prot->memory_pressure should not be changed.

Acked-by: Eric Dumazet <edumazet@...gle.com>
Reported-by: Fengguang Wu <fengguang.wu@...el.com>
Signed-off-by: Christoph Paasch <christoph.paasch@...ouvain.be>
Signed-off-by: Eric W. Biederman <ebiederm@...ssion.com>
---
 include/net/sock.h |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/include/net/sock.h b/include/net/sock.h
index c93542f92420..e3a18ff0c38b 100644
--- a/include/net/sock.h
+++ b/include/net/sock.h
@@ -1137,7 +1137,7 @@ static inline bool sk_under_memory_pressure(const struct sock *sk)
 	if (mem_cgroup_sockets_enabled && sk->sk_cgrp)
 		return !!sk->sk_cgrp->memory_pressure;
 
-	return !!sk->sk_prot->memory_pressure;
+	return !!*sk->sk_prot->memory_pressure;
 }
 
 static inline void sk_leave_memory_pressure(struct sock *sk)
-- 
1.7.5.4

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