[linux-next] LinuxNextTracking branch, master, updated. next-20130214

batman at open-mesh.org batman at open-mesh.org
Fri Feb 15 00:18:56 CET 2013

The following commit has been merged in the master branch:
commit 816cd5b83e4d8f3c8106966e64a025408caee3f6
Author: Pau Koning <paukoning at gmail.com>
Date:   Tue Feb 12 00:18:45 2013 +0000

    batman-adv: Fix NULL pointer dereference in DAT hash collision avoidance
    An entry in DAT with the hashed position of 0 can cause a NULL pointer
    dereference when the first entry is checked by batadv_choose_next_candidate.
    This first candidate automatically has the max value of 0 and the max_orig_node
    of NULL. Not checking max_orig_node for NULL in batadv_is_orig_node_eligible
    will lead to a NULL pointer dereference when checking for the lowest address.
    This problem was added in 785ea1144182c341b8b85b0f8180291839d176a8
    ("batman-adv: Distributed ARP Table - create DHT helper functions").
    Signed-off-by: Pau Koning <paukoning at gmail.com>
    Signed-off-by: David S. Miller <davem at davemloft.net>

diff --git a/net/batman-adv/distributed-arp-table.c b/net/batman-adv/distributed-arp-table.c
index 183f97a..5539215 100644
--- a/net/batman-adv/distributed-arp-table.c
+++ b/net/batman-adv/distributed-arp-table.c
@@ -440,7 +440,7 @@ static bool batadv_is_orig_node_eligible(struct batadv_dat_candidate *res,
 	/* this is an hash collision with the temporary selected node. Choose
 	 * the one with the lowest address
-	if ((tmp_max == max) &&
+	if ((tmp_max == max) && max_orig_node &&
 	    (batadv_compare_eth(candidate->orig, max_orig_node->orig) > 0))
 		goto out;


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