net/packet: fix overflow in check for priv area size

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commit 2b6867c2ce 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: Ben Hutchings <ben@decadent.org.uk>

...

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Andrey Konovalov 2017-03-29 16:11:20 +02:00 • committed by Ben Hutchings

parent 629655f798

commit a481ab4edd

1 changed files with 2 additions and 2 deletions

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net/packet/af_packet.c

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