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 <[email protected]>
---
v2: Add patch to reduce the reference counter of these functions
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;
--
2.8.1
