batman-adv: bla: fix type misuse for backbone_gw hash indexing

[ Upstream commit 097930e85f90f252c44dc0d084598265dd44ca48 ]

It seems that due to a copy & paste error the void pointer
in batadv_choose_backbone_gw() is cast to the wrong type.

Fixing this by using "struct batadv_bla_backbone_gw" instead of "struct
batadv_bla_claim" which better matches the caller's side.

For now it seems that we were lucky because the two structs both have
their orig/vid and addr/vid in the beginning. However I stumbled over
this issue when I was trying to add some debug variables in front of
"orig" in batadv_backbone_gw, which caused hash lookups to fail.

Fixes: 07568d0369f9 ("batman-adv: don't rely on positions in struct for hashing")
Signed-off-by: Linus Lüssing <ll@simonwunderlich.de>
Signed-off-by: Sven Eckelmann <sven@narfation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/net/batman-adv/bridge_loop_avoidance.c b/net/batman-adv/bridge_loop_avoidance.c
index e545b42..f8b117a 100644 (file)
--- a/net/batman-adv/bridge_loop_avoidance.c
+++ b/net/batman-adv/bridge_loop_avoidance.c
@@ -95,11 +95,12 @@ static inline u32 batadv_choose_claim(const void *data, u32 size)
  */
 static inline u32 batadv_choose_backbone_gw(const void *data, u32 size)
 {
-       const struct batadv_bla_claim *claim = (struct batadv_bla_claim *)data;
+       const struct batadv_bla_backbone_gw *gw;
        u32 hash = 0;
 
-       hash = jhash(&claim->addr, sizeof(claim->addr), hash);
-       hash = jhash(&claim->vid, sizeof(claim->vid), hash);
+       gw = (struct batadv_bla_backbone_gw *)data;
+       hash = jhash(&gw->orig, sizeof(gw->orig), hash);
+       hash = jhash(&gw->vid, sizeof(gw->vid), hash);
 
        return hash % size;
 }