netdev - [PATCH] net: ipv4: tcp_offload: check segs for NULL

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Message-id: <1481791661-21670-1-git-send-email-shakya.das@samsung.com>
Date:   Thu, 15 Dec 2016 14:17:41 +0530
From:   shakya.das@...sung.com
To:     davem@...emloft.net
Cc:     netdev@...r.kernel.org, shakya89.das@...il.com,
        vidushi.koul@...sung.com
Subject: [PATCH] net: ipv4: tcp_offload: check segs for NULL

From: Shakya Sundar Das <shakya.das@...sung.com>

This patch will check segs for being NULL in tcp_gso_segment()
before calling skb_shinfo(segs) from skb_is_gso(segs), otherwise
kernel can run into a NULL-pointer dereference.

Signed-off-by: Shakya Sundar Das <shakya.das@...sung.com>
---
 net/ipv4/tcp_offload.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/ipv4/tcp_offload.c b/net/ipv4/tcp_offload.c
index bc68da3..93feefd 100644
--- a/net/ipv4/tcp_offload.c
+++ b/net/ipv4/tcp_offload.c
@@ -96,7 +96,7 @@ struct sk_buff *tcp_gso_segment(struct sk_buff *skb,
 	skb->ooo_okay = 0;
 
 	segs = skb_segment(skb, features);
-	if (IS_ERR(segs))
+	if (IS_ERR_OR_NULL(segs))
 		goto out;
 
 	/* Only first segment might have ooo_okay set */
-- 
1.7.9.5