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

[Eric Dumazet]

From: Eric Dumazet <eduma...@google.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 <eduma...@google.com>
Cc: David Lebrun <david.leb...@uclouvain.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);