From fba04a9e0c869498889b6445fd06cbe7da9bb834 Mon Sep 17 00:00:00 2001 From: Alexander Drozdov Date: Tue, 17 Feb 2015 13:33:46 +0300 Subject: [PATCH] ipv4: ip_check_defrag should correctly check return value of skb_copy_bits 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 Acked-by: Eric Dumazet Signed-off-by: David S. Miller --- 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 e5b6d0ddcb58..2c8d98e728c0 100644 --- a/net/ipv4/ip_fragment.c +++ b/net/ipv4/ip_fragment.c @@ -664,7 +664,7 @@ 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) -- 2.20.1