netdev - [PATCH net] ipv6: seg6_genl_set_tunsrc() must check kmemdup() return value

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Date:   Fri, 20 Jan 2017 07:57:42 -0800
From:   Eric Dumazet <eric.dumazet@...il.com>
To:     David Miller <davem@...emloft.net>
Cc:     netdev <netdev@...r.kernel.org>,
        David Lebrun <david.lebrun@...ouvain.be>
Subject: [PATCH net] ipv6: seg6_genl_set_tunsrc() must check kmemdup()
 return value

From: Eric Dumazet <edumazet@...gle.com>

seg6_genl_get_tunsrc() and set_tun_src() do not handle tun_src being
possibly NULL, so we must check kmemdup() return value and abort if
it is NULL

Fixes: 915d7e5e5930 ("ipv6: sr: add code base for control plane support of SR-IPv6")
Signed-off-by: Eric Dumazet <edumazet@...gle.com>
Cc: David Lebrun <david.lebrun@...ouvain.be>
---
 net/ipv6/seg6.c |    2 ++
 1 file changed, 2 insertions(+)

diff --git a/net/ipv6/seg6.c b/net/ipv6/seg6.c
index b172d85c650a376f541ea05d72046c76b8404303..a855eb325b030a666fe92c56a2d432c77d9dfe7a 100644
--- a/net/ipv6/seg6.c
+++ b/net/ipv6/seg6.c
@@ -176,6 +176,8 @@ static int seg6_genl_set_tunsrc(struct sk_buff *skb, struct genl_info *info)
 
 	val = nla_data(info->attrs[SEG6_ATTR_DST]);
 	t_new = kmemdup(val, sizeof(*val), GFP_KERNEL);
+	if (!t_new)
+		return -ENOMEM;
 
 	mutex_lock(&sdata->lock);