linux-kernel - [PATCH 3.12 079/175] ipv4: ip_check_defrag should correctly check return value of skb_copy

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Message-Id: <c0c6450b332d51df46cbe3a697991e42e7460a2e.1426581621.git.jslaby@suse.cz>
Date:	Tue, 17 Mar 2015 09:40:57 +0100
From:	Jiri Slaby <jslaby@...e.cz>
To:	stable@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org,
	Alexander Drozdov <al.drozdov@...il.com>,
	"David S. Miller" <davem@...emloft.net>,
	Jiri Slaby <jslaby@...e.cz>
Subject: [PATCH 3.12 079/175] ipv4: ip_check_defrag should correctly check return value of skb_copy_bits

From: Alexander Drozdov <al.drozdov@...il.com>

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

===============

[ Upstream commit fba04a9e0c869498889b6445fd06cbe7da9bb834 ]

skb_copy_bits() returns zero on success and negative value on error,
so it is needed to invert the condition in ip_check_defrag().

Fixes: 1bf3751ec90c ("ipv4: ip_check_defrag must not modify skb before unsharing")
Signed-off-by: Alexander Drozdov <al.drozdov@...il.com>
Acked-by: Eric Dumazet <edumazet@...gle.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Jiri Slaby <jslaby@...e.cz>
---
 net/ipv4/ip_fragment.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/ipv4/ip_fragment.c b/net/ipv4/ip_fragment.c
index b66910aaef4d..5fff3d466e90 100644
--- a/net/ipv4/ip_fragment.c
+++ b/net/ipv4/ip_fragment.c
@@ -683,7 +683,7 @@ struct sk_buff *ip_check_defrag(struct sk_buff *skb, u32 user)
 	if (skb->protocol != htons(ETH_P_IP))
 		return skb;
 
-	if (!skb_copy_bits(skb, 0, &iph, sizeof(iph)))
+	if (skb_copy_bits(skb, 0, &iph, sizeof(iph)) < 0)
 		return skb;
 
 	if (iph.ihl < 5 || iph.version != 4)
-- 
2.3.0

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