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Date: Wed, 3 Mar 2010 07:40:01 +0100
From: Jiri Pirko <jpirko@...hat.com>
To: netdev@...r.kernel.org
Cc: davem@...emloft.net, linux-wireless@...r.kernel.org,
netdev@...r.kernel.org, tcpdump-workers@...ts.tcpdump.org,
proski@....org
Subject: [net-2.6 PATCH] af_packet: move strict addr_len check right before
dev_[mc/unicast]_[add/del]
Subject: [net-2.6 PATCH] af_packet: move strict addr_len check right before dev_[mc/unicast]_[add/del]
My previous patch 914c8ad2d18b62ad1420f518c0cab0b0b90ab308 incorrectly changed
the length check in packet_mc_add to be more strict. The problem is that
userspace is not filling this field (and it stays zeroed) in case of setting
PACKET_MR_PROMISC or PACKET_MR_ALLMULTI. So move the strict check to the point
in path where the addr_len must be set correctly.
Signed-off-by: Jiri Pirko <jpirko@...hat.com>
diff --git a/net/packet/af_packet.c b/net/packet/af_packet.c
index 031a5e6..1612d41 100644
--- a/net/packet/af_packet.c
+++ b/net/packet/af_packet.c
@@ -1688,6 +1688,8 @@ static int packet_dev_mc(struct net_device *dev, struct packet_mclist *i,
{
switch (i->type) {
case PACKET_MR_MULTICAST:
+ if (i->alen != dev->addr_len)
+ return -EINVAL;
if (what > 0)
return dev_mc_add(dev, i->addr, i->alen, 0);
else
@@ -1700,6 +1702,8 @@ static int packet_dev_mc(struct net_device *dev, struct packet_mclist *i,
return dev_set_allmulti(dev, what);
break;
case PACKET_MR_UNICAST:
+ if (i->alen != dev->addr_len)
+ return -EINVAL;
if (what > 0)
return dev_unicast_add(dev, i->addr);
else
@@ -1734,7 +1738,7 @@ static int packet_mc_add(struct sock *sk, struct packet_mreq_max *mreq)
goto done;
err = -EINVAL;
- if (mreq->mr_alen != dev->addr_len)
+ if (mreq->mr_alen > dev->addr_len)
goto done;
err = -ENOBUFS;
--
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