commit b706b2e5efce7c3773996d7f32a4fe004b868fe9
author Eric Dumazet <edumazet@google.com> Fri Mar 24 19:36:13 2017 -0700
committer chrmhoffmann <chrmhoffmann@gmail.com> Sat Aug 12 10:37:01 2017 +0200
tree f12cf741454b2b41952354ce68cc116f1380054d
parent 8dae44db4ee160631d559678f0f615b01302e044

ping: implement proper locking

We got a report of yet another bug in ping

http://www.openwall.com/lists/oss-security/2017/03/24/6

->disconnect() is not called with socket lock held.

Fix this by acquiring ping rwlock earlier.

Thanks to Daniel, Alexander and Andrey for letting us know this problem.

Change-Id: Id88438e5c31f4dc168de68a5334dcf8592070515
Fixes: c319b4d76b9e ("net: ipv4: add IPPROTO_ICMP socket kind")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reported-by: Daniel Jiang <danieljiang0415@gmail.com>
Reported-by: Solar Designer <solar@openwall.com>
Reported-by: Andrey Konovalov <andreyknvl@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
(cherry picked from commit 43a6684519ab0a6c52024b5e25322476cabad893)
Fixes: CVE-2017-2671
Signed-off-by: Joel Stanley <joel@jms.id.au>