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net/core: __hw_addr_sync_one / _multiple broken

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Currently, __hw_addr_sync_one is called in a loop by
__hw_addr_sync_multiple to sync each of a "from" device's hw addresses
to a "to" device.  __hw_addr_sync_one calls __hw_addr_add_ex to attempt
to add each address.  __hw_addr_add_ex is called with global=false, and
sync=true.

	__hw_addr_add_ex checks to see if the new address matches an
address already on the list.  If so, it tests global and sync.  In this
case, sync=true, and it then checks if the address is already synced,
and if so, returns 0.

	This 0 return causes __hw_addr_sync_one to increment the sync_cnt
and refcount for the "from" list's address entry, even though the address
is already synced and has a reference and sync_cnt.  This will cause
the sync_cnt and refcount to increment without bound every time an
addresses is added to the "from" device and synced to the "to" device.

	The fix here has two parts:

	First, when __hw_addr_add_ex finds the address already exists
and is synced, return -EEXIST instead of 0.

	Second, __hw_addr_sync_one checks the error return for -EEXIST,
and if so, it (a) does not add a refcount/sync_cnt, and (b) returns 0
itself so that __hw_addr_sync_multiple will not return an error.

Signed-off-by: Jay Vosburgh <fubar@us.ibm.com>
Reviewed-by: Vlad Yasevich <vyasevic@redhat.com>
Tested-by: Shawn Bohrer <sbohrer@rgmadvisors.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jay Vosburgh 2013-05-31 11:57:28 +00:00 committed by David S. Miller
parent 60ba834c2f
commit 29ca2f8fcc
1 changed files with 7 additions and 4 deletions
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11
net/core/dev_addr_lists.c
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@ -67,7 +67,7 @@ static int __hw_addr_add_ex(struct netdev_hw_addr_list *list,
}
if (sync) {
if (ha->synced)
return 0;
return -EEXIST;
else
ha->synced = true;
}
@ -140,10 +140,13 @@ static int __hw_addr_sync_one(struct netdev_hw_addr_list *to_list,
err = __hw_addr_add_ex(to_list, ha->addr, addr_len, ha->type,
false, true);
if (err)
if (err && err != -EEXIST)
return err;
ha->sync_cnt++;
ha->refcount++;
if (!err) {
ha->sync_cnt++;
ha->refcount++;
}
return 0;
}