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net/packet: fix overflow in check for priv area size
authorAndrey Konovalov <andreyknvl@google.com>
Wed, 29 Mar 2017 14:11:20 +0000 (16:11 +0200)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Tue, 18 Apr 2017 05:11:49 +0000 (07:11 +0200)
commit16fc98c2479f5477f2df220acd9cb53686e33f4c
tree4cf917283f551431ab104a2622ddce1f226fa578
parent0ee72d8f9b8e17b8e4ccfebc7a25cbc2d395cd6a
net/packet: fix overflow in check for priv area size

commit 2b6867c2ce76c596676bec7d2d525af525fdc6e2 upstream.

Subtracting tp_sizeof_priv from tp_block_size and casting to int
to check whether one is less then the other doesn't always work
(both of them are unsigned ints).

Compare them as is instead.

Also cast tp_sizeof_priv to u64 before using BLK_PLUS_PRIV, as
it can overflow inside BLK_PLUS_PRIV otherwise.

Signed-off-by: Andrey Konovalov <andreyknvl@google.com>
Acked-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
net/packet/af_packet.c