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authorWANG Cong <xiyou.wangcong@gmail.com>2017-02-28 01:07:43 +0100
committerDavid S. Miller <davem@davemloft.net>2017-03-02 21:43:47 +0100
commite3330039ea28dc199e3b2da993895ff742a91adf (patch)
treee2755e80b6742c3f4b8a82464210f52c87b20e65 /drivers
parentipv6: orphan skbs in reassembly unit (diff)
downloadlinux-e3330039ea28dc199e3b2da993895ff742a91adf.tar.xz
linux-e3330039ea28dc199e3b2da993895ff742a91adf.zip
ipv6: check for ip6_null_entry in __ip6_del_rt_siblings()
Andrey reported a NULL pointer deref bug in ipv6_route_ioctl() -> ip6_route_del() -> __ip6_del_rt_siblings() code path. This is because ip6_null_entry is returned in this path since ip6_null_entry is kinda default for a ipv6 route table root node. Quote from David Ahern: ip6_null_entry is the root of all ipv6 fib tables making it integrated into the table ... We should ignore any attempt of trying to delete it, like we do in __ip6_del_rt() path and several others. Reported-by: Andrey Konovalov <andreyknvl@google.com> Fixes: 0ae8133586ad ("net: ipv6: Allow shorthand delete of all nexthops in multipath route") Cc: David Ahern <dsa@cumulusnetworks.com> Cc: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com> Acked-by: David Ahern <dsa@cumulusnetworks.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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