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| author | Jiri Pirko <jpirko@redhat.com> | 2010-03-02 20:40:01 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2010-03-03 01:04:38 -0800 |
| commit | 1162563f82b434e3099c9e6c1bbdba846d792f0d (patch) | |
| tree | 3903e4265740f2b2049615d7178aa434252bf5f3 /net/packet | |
| parent | 9fe969345b10931319b3f1e7034fbdeb786de234 (diff) | |
| download | linux-1162563f82b434e3099c9e6c1bbdba846d792f0d.tar.gz linux-1162563f82b434e3099c9e6c1bbdba846d792f0d.tar.bz2 linux-1162563f82b434e3099c9e6c1bbdba846d792f0d.zip | |
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@redhat.com>
Reported-by: Pavel Roskin <proski@gnu.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/packet')
| -rw-r--r-- | net/packet/af_packet.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/net/packet/af_packet.c b/net/packet/af_packet.c index 031a5e6fb4aa..1612d417d10c 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; |