fib_trie: Avoid NULL pointer if local table is not allocated

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The function fib_unmerge assumed the local table had already been
allocated.  If that is not the case however when custom rules are applied
then this can result in a NULL pointer dereference.

In order to prevent this we must check the value of the local table pointer
and if it is NULL simply return 0 as there is no local table to separate
from the main.

Fixes: 0ddcf43d5 ("ipv4: FIB Local/MAIN table collapse")
Reported-by: Madhu Challa <challa@noironetworks.com>
Signed-off-by: Alexander Duyck <alexander.h.duyck@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

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Alexander Duyck 2015-03-12 14:46:23 -07:00 • committed by David S. Miller

parent 80f1d68ccb

commit 3c9e9f7320

1 changed files with 4 additions and 1 deletions

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net/ipv4/fib_frontend.c

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