ipv6: Check rt->dst.from for the DST_NOCACHE route
authorMartin KaFai Lau <kafai@fb.com>
Wed, 11 Nov 2015 19:51:08 +0000 (11:51 -0800)
committerDavid S. Miller <davem@davemloft.net>
Sun, 15 Nov 2015 22:12:37 +0000 (17:12 -0500)
commit02bcf4e082e4dc634409a6a6cb7def8806d6e5e6
treea89c1669beceedfd440dfeda07a5046e17e43124
parent5973fb1e245086071bf71994c8b54d99526ded03
ipv6: Check rt->dst.from for the DST_NOCACHE route

All DST_NOCACHE rt6_info used to have rt->dst.from set to
its parent.

After commit 8e3d5be73681 ("ipv6: Avoid double dst_free"),
DST_NOCACHE is also set to rt6_info which does not have
a parent (i.e. rt->dst.from is NULL).

This patch catches the rt->dst.from == NULL case.

Fixes: 8e3d5be73681 ("ipv6: Avoid double dst_free")
Signed-off-by: Martin KaFai Lau <kafai@fb.com>
Cc: Hannes Frederic Sowa <hannes@stressinduktion.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
include/net/ip6_fib.h
net/ipv6/route.c