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[NEIGH]: Ensure that pneigh_lookup is protected with RTNL

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The pnigh_lookup is used to lookup proxy entries and to 
create them in case lookup failed. 

However, the "creation" code does not perform the re-lookup
after GFP_KERNEL allocation. This is done because the code
is expected to be protected with the RTNL lock, so add the 
assertion (mainly to address future questions from new network 
developers like me :) ).

Signed-off-by: Pavel Emelyanov <xemul@openvz.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Pavel Emelyanov 2007-10-15 12:54:15 -07:00 committed by David S. Miller
parent f1673ca52c
commit 4ae289444b
1 changed files with 2 additions and 0 deletions
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2
net/core/neighbour.c
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@ -481,6 +481,8 @@ struct pneigh_entry * pneigh_lookup(struct neigh_table *tbl, const void *pkey,
if (!creat)
goto out;
ASSERT_RTNL();
n = kmalloc(sizeof(*n) + key_len, GFP_KERNEL);
if (!n)
goto out;