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

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[ 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: 07568d0369 ("batman-adv: don't rely on positions in struct for hashing")
Signed-off-by: Linus Lüssing <[email protected]>
Signed-off-by: Sven Eckelmann <[email protected]>
Signed-off-by: Sasha Levin <[email protected]>
This commit is contained in:
Linus Lüssing 2020-08-27 17:34:48 +02:00 • committed by Greg Kroah-Hartman
commit e0117ad11b
1 changed files with 4 additions and 3 deletions
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7
net/batman-adv/bridge_loop_avoidance.c
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@ -83,11 +83,12 @@ 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;
}