diff options
| author | Sven Eckelmann | 2016-05-06 11:43:38 +0200 |
|---|---|---|
| committer | Antonio Quartulli | 2016-05-18 11:49:39 +0800 |
| commit | a45e932a3c58eac11a7458c6888910e23f615077 (patch) | |
| tree | f397605a50fac1cb444e9f3f7083defbbcfbc18d /net | |
| parent | 63d443efe8be2c1d02b30d7e4edeb9aa085352b3 (diff) | |
batman-adv: Avoid nullptr derefence in batadv_v_neigh_is_sob
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: 9786906022eb ("batman-adv: B.A.T.M.A.N. V - implement neighbor comparison API calls")
Signed-off-by: Sven Eckelmann <sven@narfation.org>
Signed-off-by: Marek Lindner <mareklindner@neomailbox.ch>
Signed-off-by: Antonio Quartulli <a@unstable.cc>
Diffstat (limited to 'net')
| -rw-r--r-- | net/batman-adv/bat_v.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/net/batman-adv/bat_v.c b/net/batman-adv/bat_v.c index 3ff8bd1b7bdc..50bfcf87f569 100644 --- a/net/batman-adv/bat_v.c +++ b/net/batman-adv/bat_v.c @@ -27,6 +27,7 @@ #include <linux/rculist.h> #include <linux/rcupdate.h> #include <linux/seq_file.h> +#include <linux/stddef.h> #include <linux/types.h> #include <linux/workqueue.h> @@ -276,6 +277,9 @@ 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; |