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| author | Linus Lüssing <linus.luessing@web.de> | 2011-03-14 22:43:37 +0000 |
|---|---|---|
| committer | Sven Eckelmann <sven@narfation.org> | 2011-04-17 21:11:01 +0200 |
| commit | e1a5382f978b67b5cc36eec65e6046730ce07714 (patch) | |
| tree | f7ca07cde3a49858d0cfa33e0189a659a1fcc95d /net/batman-adv/send.c | |
| parent | 57f0c07c4d0da8bcc23e21c330fe9c7c5cf776b5 (diff) | |
| download | op-kernel-dev-e1a5382f978b67b5cc36eec65e6046730ce07714.zip op-kernel-dev-e1a5382f978b67b5cc36eec65e6046730ce07714.tar.gz | |
batman-adv: Make orig_node->router an rcu protected pointer
The rcu protected macros rcu_dereference() and rcu_assign_pointer()
for the orig_node->router need to be used, as well as spin/rcu locking.
Otherwise we might end up using a router pointer pointing to already
freed memory.
Therefore this commit introduces the safe getter method
orig_node_get_router().
Signed-off-by: Linus Lüssing <linus.luessing@web.de>
Signed-off-by: Marek Lindner <lindner_marek@yahoo.de>
Signed-off-by: Sven Eckelmann <sven@narfation.org>
Diffstat (limited to 'net/batman-adv/send.c')
| -rw-r--r-- | net/batman-adv/send.c | 19 |
1 files changed, 12 insertions, 7 deletions
diff --git a/net/batman-adv/send.c b/net/batman-adv/send.c index d49e54d..e78670c 100644 --- a/net/batman-adv/send.c +++ b/net/batman-adv/send.c @@ -308,6 +308,7 @@ void schedule_forward_packet(struct orig_node *orig_node, struct hard_iface *if_incoming) { struct bat_priv *bat_priv = netdev_priv(if_incoming->soft_iface); + struct neigh_node *router; unsigned char in_tq, in_ttl, tq_avg = 0; unsigned long send_time; @@ -316,6 +317,8 @@ void schedule_forward_packet(struct orig_node *orig_node, return; } + router = orig_node_get_router(orig_node); + in_tq = batman_packet->tq; in_ttl = batman_packet->ttl; @@ -324,20 +327,22 @@ void schedule_forward_packet(struct orig_node *orig_node, /* rebroadcast tq of our best ranking neighbor to ensure the rebroadcast * of our best tq value */ - if ((orig_node->router) && (orig_node->router->tq_avg != 0)) { + if (router && router->tq_avg != 0) { /* rebroadcast ogm of best ranking neighbor as is */ - if (!compare_eth(orig_node->router->addr, ethhdr->h_source)) { - batman_packet->tq = orig_node->router->tq_avg; + if (!compare_eth(router->addr, ethhdr->h_source)) { + batman_packet->tq = router->tq_avg; - if (orig_node->router->last_ttl) - batman_packet->ttl = orig_node->router->last_ttl - - 1; + if (router->last_ttl) + batman_packet->ttl = router->last_ttl - 1; } - tq_avg = orig_node->router->tq_avg; + tq_avg = router->tq_avg; } + if (router) + neigh_node_free_ref(router); + /* apply hop penalty */ batman_packet->tq = hop_penalty(batman_packet->tq, bat_priv); |
