commit 276bdb82dedb290511467a5a4fdbe9f0b52dce6f
author Mathias Krause <minipli@googlemail.com> Wed Aug 15 11:31:54 2012 +0000
committer David S. Miller <davem@davemloft.net> Wed Aug 15 21:36:31 2012 -0700
tree 0882e07c971f4254c5fe07c0e3eefadb8c6cfda0
parent 3592aaeb80290bda0f2cf0b5456c97bfc638b192

dccp: check ccid before dereferencing

ccid_hc_rx_getsockopt() and ccid_hc_tx_getsockopt() might be called with
a NULL ccid pointer leading to a NULL pointer dereference. This could
lead to a privilege escalation if the attacker is able to map page 0 and
prepare it with a fake ccid_ops pointer.

Signed-off-by: Mathias Krause <minipli@googlemail.com>
Cc: Gerrit Renker <gerrit@erg.abdn.ac.uk>
Cc: stable@vger.kernel.org
Signed-off-by: David S. Miller <davem@davemloft.net>