linux-kernel - [PATCH 4.8 21/45] GSO: Reload iph after pskb_may

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Date:   Fri,  9 Dec 2016 17:20:50 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Eric Dumazet <eric.dumazet@...il.com>,
        Alexander Duyck <aduyck@...antis.com>,
        Andrey Konovalov <andreyknvl@...gle.com>,
        Arnaldo Carvalho de Melo <acme@...hat.com>,
        Alexander Duyck <alexander.h.duyck@...el.com>,
        "David S. Miller" <davem@...emloft.net>
Subject: [PATCH 4.8 21/45] GSO: Reload iph after pskb_may_pull

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

------------------

From: Arnaldo Carvalho de Melo <acme@...nel.org>


[ Upstream commit a510887824171ad260cc4a2603396c6247fdd091 ]

As it may get stale and lead to use after free.

Acked-by: Eric Dumazet <eric.dumazet@...il.com>
Cc: Alexander Duyck <aduyck@...antis.com>
Cc: Andrey Konovalov <andreyknvl@...gle.com>
Fixes: cbc53e08a793 ("GSO: Add GSO type for fixed IPv4 ID")
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
Acked-by: Alexander Duyck <alexander.h.duyck@...el.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 net/ipv4/af_inet.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/net/ipv4/af_inet.c
+++ b/net/ipv4/af_inet.c
@@ -1237,7 +1237,7 @@ struct sk_buff *inet_gso_segment(struct
 		fixedid = !!(skb_shinfo(skb)->gso_type & SKB_GSO_TCP_FIXEDID);
 
 		/* fixed ID is invalid if DF bit is not set */
-		if (fixedid && !(iph->frag_off & htons(IP_DF)))
+		if (fixedid && !(ip_hdr(skb)->frag_off & htons(IP_DF)))
 			goto out;
 	}