tree f6d7dd295193a0456d5664316849153ec162bf26
parent e7d7956673d986001c2a4e564133e0c4d2e3a082
author Eric Dumazet <edumazet@google.com> 1521043456 -0700
committer Greg Kroah-Hartman <gregkh@linuxfoundation.org> 1522512693 +0200

net: use skb_to_full_sk() in skb_update_prio()


[ Upstream commit 4dcb31d4649df36297296b819437709f5407059c ]

Andrei Vagin reported a KASAN: slab-out-of-bounds error in
skb_update_prio()

Since SYNACK might be attached to a request socket, we need to
get back to the listener socket.
Since this listener is manipulated without locks, add const
qualifiers to sock_cgroup_prioidx() so that the const can also
be used in skb_update_prio()

Also add the const qualifier to sock_cgroup_classid() for consistency.

Fixes: ca6fb0651883 ("tcp: attach SYNACK messages to request sockets instead of listener")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reported-by: Andrei Vagin <avagin@virtuozzo.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>