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atm: clip: remove clip_tbl 

Commit 32092ecf06 (atm: clip: Use device neigh support on top of
"arp_tbl".) introduced a bug since clip_tbl is zeroed : Crash occurs in
__neigh_for_each_release()

idle_timer_check() must use instead arp_tbl and neigh_check_cb() should
ignore non clip neighbours.

Idea from David Miller.

Reported-by: Meelis Roos <mroos@linux.ee>
Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Tested-by: Meelis Roos <mroos@linux.ee>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2012-02-21 10:46:49 +00:00 committed by David S. Miller
parent a5e7424d42
commit 597cdbc223
1 changed files with 6 additions and 4 deletions
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10
net/atm/clip.c
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@ -46,8 +46,8 @@
static struct net_device *clip_devs;
static struct atm_vcc *atmarpd;
static struct neigh_table clip_tbl;
static struct timer_list idle_timer;
static const struct neigh_ops clip_neigh_ops;
static int to_atmarpd(enum atmarp_ctrl_type type, int itf, __be32 ip)
{
@ -123,6 +123,8 @@ static int neigh_check_cb(struct neighbour *n)
struct atmarp_entry *entry = neighbour_priv(n);
struct clip_vcc *cv;
if (n->ops != &clip_neigh_ops)
return 0;
for (cv = entry->vccs; cv; cv = cv->next) {
unsigned long exp = cv->last_use + cv->idle_timeout;
@ -154,10 +156,10 @@ static int neigh_check_cb(struct neighbour *n)
static void idle_timer_check(unsigned long dummy)
{
write_lock(&clip_tbl.lock);
__neigh_for_each_release(&clip_tbl, neigh_check_cb);
write_lock(&arp_tbl.lock);
__neigh_for_each_release(&arp_tbl, neigh_check_cb);
mod_timer(&idle_timer, jiffies + CLIP_CHECK_INTERVAL * HZ);
write_unlock(&clip_tbl.lock);
write_unlock(&arp_tbl.lock);
}
static int clip_arp_rcv(struct sk_buff *skb)