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bridge: fix crash when set mac address of br interface 

When I tried to set mac address of a bridge interface to a mac
address which already learned on this bridge, I got system hang.

The cause is straight forward: function br_fdb_change_mac_address
calls fdb_insert with NULL source nbp. Then an fdb lookup is
performed. If an fdb entry is found and it's local, it's OK. But
if it's not local, source is dereferenced for printk without NULL
check.

Signed-off-by: Hong Zhiguo <honkiko@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Hong zhi guo 2013-03-23 02:27:50 +00:00 committed by David S. Miller
parent 4a7df340ed
commit 9b46922e15
1 changed files with 1 additions and 1 deletions
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2
net/bridge/br_fdb.c
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@ -423,7 +423,7 @@ static int fdb_insert(struct net_bridge *br, struct net_bridge_port *source,
return 0;
br_warn(br, "adding interface %s with same address "
"as a received packet\n",
source->dev->name);
source ? source->dev->name : br->dev->name);
fdb_delete(br, fdb);
}