batadv_neigh_ifinfo_get can return NULL when it cannot find (even when only temporarily) anymore the neigh_ifinfo in the list neigh->ifinfo_list. This has to be checked to avoid kernel Oopses when the ifinfo is dereferenced.

This a situation which isn't expected but is already handled by functions like batadv_v_neigh_cmp. The same kind of warning is therefore used before the function returns without dereferencing the pointers.

Fixes: b05bbab5e1fc ("batman-adv: B.A.T.M.A.N. V - implement neighbor comparison API calls") Signed-off-by: Sven Eckelmann sven@narfation.org --- net/batman-adv/bat_v.c | 3 +++ 1 file changed, 3 insertions(+)

diff --git a/net/batman-adv/bat_v.c b/net/batman-adv/bat_v.c index 927d405..f271ae8 100644 --- a/net/batman-adv/bat_v.c +++ b/net/batman-adv/bat_v.c @@ -286,6 +286,9 @@ static bool batadv_v_neigh_is_sob(struct batadv_neigh_node *neigh1, ifinfo1 = batadv_neigh_ifinfo_get(neigh1, if_outgoing1); ifinfo2 = batadv_neigh_ifinfo_get(neigh2, if_outgoing2);

+ if (WARN_ON(!ifinfo1 || !ifinfo2)) + return false; + threshold = ifinfo1->bat_v.throughput / 4; threshold = ifinfo1->bat_v.throughput - threshold;