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net/packet: fix 4gb buffer limit due to overflow check 

[ Upstream commit fc62814d690cf62189854464f4bd07457d5e9e50 ]

When calculating rb->frames_per_block * req->tp_block_nr the result
can overflow. Check it for overflow without limiting the total buffer
size to UINT_MAX.

This change fixes support for packet ring buffers >= UINT_MAX.

Fixes: 8f8d28e4d6d8 ("net/packet: fix overflow in check for tp_frame_nr")
Signed-off-by: Kal Conley <kal.conley@dectris.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Kal Conley 2019-02-10 09:57:11 +01:00 committed by syphyr
parent 6ecf74942f
commit 8e9c6aa81d
1 changed files with 1 additions and 1 deletions
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2
net/packet/af_packet.c
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@ -3775,7 +3775,7 @@ static int packet_set_ring(struct sock *sk, union tpacket_req_u *req_u,
rb->frames_per_block = req->tp_block_size/req->tp_frame_size;
if (unlikely(rb->frames_per_block <= 0))
goto out;
if (unlikely(req->tp_block_size > UINT_MAX / req->tp_block_nr))
if (unlikely(rb->frames_per_block > UINT_MAX / req->tp_block_nr))
goto out;
if (unlikely((rb->frames_per_block * req->tp_block_nr) !=
req->tp_frame_nr))