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https://github.com/Divested-Mobile/DivestOS-Build.git
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40 lines
1.4 KiB
Diff
40 lines
1.4 KiB
Diff
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From 2b6867c2ce76c596676bec7d2d525af525fdc6e2 Mon Sep 17 00:00:00 2001
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From: Andrey Konovalov <andreyknvl@google.com>
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Date: Wed, 29 Mar 2017 16:11:20 +0200
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Subject: net/packet: fix overflow in check for priv area size
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Subtracting tp_sizeof_priv from tp_block_size and casting to int
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to check whether one is less then the other doesn't always work
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(both of them are unsigned ints).
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Compare them as is instead.
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Also cast tp_sizeof_priv to u64 before using BLK_PLUS_PRIV, as
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it can overflow inside BLK_PLUS_PRIV otherwise.
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Signed-off-by: Andrey Konovalov <andreyknvl@google.com>
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Acked-by: Eric Dumazet <edumazet@google.com>
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Signed-off-by: David S. Miller <davem@davemloft.net>
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---
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net/packet/af_packet.c | 4 ++--
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1 file changed, 2 insertions(+), 2 deletions(-)
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diff --git a/net/packet/af_packet.c b/net/packet/af_packet.c
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index a0dbe7c..2323ee3 100644
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--- a/net/packet/af_packet.c
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+++ b/net/packet/af_packet.c
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@@ -4193,8 +4193,8 @@ static int packet_set_ring(struct sock *sk, union tpacket_req_u *req_u,
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if (unlikely(!PAGE_ALIGNED(req->tp_block_size)))
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goto out;
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if (po->tp_version >= TPACKET_V3 &&
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- (int)(req->tp_block_size -
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- BLK_PLUS_PRIV(req_u->req3.tp_sizeof_priv)) <= 0)
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+ req->tp_block_size <=
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+ BLK_PLUS_PRIV((u64)req_u->req3.tp_sizeof_priv))
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goto out;
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if (unlikely(req->tp_frame_size < po->tp_hdrlen +
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po->tp_reserve))
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--
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cgit v1.1
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