linux-kernel - Re: [PATCH] ipv4: ip_check_defrag should correctly check return value of skb_copy

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Message-ID: <CAOJe8K0dtLufmLmRU2az=ZX8Wu1JsBS-U=jewRGCQkL8atXr1Q@mail.gmail.com>
Date:	Tue, 17 Feb 2015 17:33:47 +0400
From:	Denis Kirjanov <kda@...ux-powerpc.org>
To:	Alexander Drozdov <al.drozdov@...il.com>
Cc:	"David S. Miller" <davem@...emloft.net>,
	Alexey Kuznetsov <kuznet@....inr.ac.ru>,
	James Morris <jmorris@...ei.org>,
	Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
	Patrick McHardy <kaber@...sh.net>, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ipv4: ip_check_defrag should correctly check return value
 of skb_copy_bits

On 2/17/15, Alexander Drozdov <al.drozdov@...il.com> wrote:
> skb_copy_bits() returns zero on success and negative value on error,
> so it is needed to invert the condition in ip_check_defrag().
>

Nice. Grepping through the net directory shows that the  skb_copy_bits()
return value is completely ignored in net/wireless/util.c


> Fixes: 1bf3751ec90c ("ipv4: ip_check_defrag must not modify skb before
> unsharing")
> Signed-off-by: Alexander Drozdov <al.drozdov@...il.com>
> ---
>  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 e5b6d0d..2c8d98e 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)
> --
> 1.9.1
>
> --
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