batman-adv: don't rely on positions in struct for hashing
The hash functions in the bridge loop avoidance code expects the
VLAN vid to be right after the mac address, but this is not guaranteed.
Fix this by explicitly hashing over the right fields of the struct.
Reported-by: Marek Lindner <lindner_marek@yahoo.de>
Signed-off-by: Simon Wunderlich <siwu@hrz.tu-chemnitz.de>
Signed-off-by: Antonio Quartulli <ordex@autistici.org>
diff --git a/net/batman-adv/bridge_loop_avoidance.c b/net/batman-adv/bridge_loop_avoidance.c
index 29a5542..49c35a6 100644
--- a/net/batman-adv/bridge_loop_avoidance.c
+++ b/net/batman-adv/bridge_loop_avoidance.c
@@ -40,15 +40,11 @@
/* return the index of the claim */
static inline uint32_t batadv_choose_claim(const void *data, uint32_t size)
{
- const unsigned char *key = data;
+ struct batadv_claim *claim = (struct batadv_claim *)data;
uint32_t hash = 0;
- size_t i;
- for (i = 0; i < ETH_ALEN + sizeof(short); i++) {
- hash += key[i];
- hash += (hash << 10);
- hash ^= (hash >> 6);
- }
+ hash = batadv_hash_bytes(hash, &claim->addr, sizeof(claim->addr));
+ hash = batadv_hash_bytes(hash, &claim->vid, sizeof(claim->vid));
hash += (hash << 3);
hash ^= (hash >> 11);
@@ -61,15 +57,11 @@
static inline uint32_t batadv_choose_backbone_gw(const void *data,
uint32_t size)
{
- const unsigned char *key = data;
+ struct batadv_claim *claim = (struct batadv_claim *)data;
uint32_t hash = 0;
- size_t i;
- for (i = 0; i < ETH_ALEN + sizeof(short); i++) {
- hash += key[i];
- hash += (hash << 10);
- hash ^= (hash >> 6);
- }
+ hash = batadv_hash_bytes(hash, &claim->addr, sizeof(claim->addr));
+ hash = batadv_hash_bytes(hash, &claim->vid, sizeof(claim->vid));
hash += (hash << 3);
hash ^= (hash >> 11);