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netfilter: ipt_ULOG: fix incorrect setting of ulog timer 

The parameter of setup_timer should be &ulog->nlgroup[i].
the incorrect parameter will cause kernel panic in
ulog_timer.

Bug introducted in commit 355430671a
"netfilter: ipt_ULOG: add net namespace support for ipt_ULOG"

ebt_ULOG doesn't have this problem.

[ I have mangled this patch to fix nlgroup != 0 case, we were
  also crashing there --pablo ]

Tested-by: George Spelvin <linux@horizon.com>
Reported-by: Borislav Petkov <bp@alien8.de>
Signed-off-by: Gao feng <gaofeng@cn.fujitsu.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Gao feng 2013-06-24 17:04:02 +08:00 committed by Pablo Neira Ayuso
parent 797a7d66d2
commit c8fc51cfa7
1 changed files with 8 additions and 4 deletions
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12
net/ipv4/netfilter/ipt_ULOG.c
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@ -125,15 +125,16 @@ static void ulog_send(struct ulog_net *ulog, unsigned int nlgroupnum)
/* timer function to flush queue in flushtimeout time */
static void ulog_timer(unsigned long data)
{
unsigned int groupnum = *((unsigned int *)data);
struct ulog_net *ulog = container_of((void *)data,
struct ulog_net,
nlgroup[*(unsigned int *)data]);
nlgroup[groupnum]);
pr_debug("timer function called, calling ulog_send\n");
/* lock to protect against somebody modifying our structure
* from ipt_ulog_target at the same time */
spin_lock_bh(&ulog->lock);
ulog_send(ulog, data);
ulog_send(ulog, groupnum);
spin_unlock_bh(&ulog->lock);
}
@ -407,8 +408,11 @@ static int __net_init ulog_tg_net_init(struct net *net)
spin_lock_init(&ulog->lock);
/* initialize ulog_buffers */
for (i = 0; i < ULOG_MAXNLGROUPS; i++)
setup_timer(&ulog->ulog_buffers[i].timer, ulog_timer, i);
for (i = 0; i < ULOG_MAXNLGROUPS; i++) {
ulog->nlgroup[i] = i;
setup_timer(&ulog->ulog_buffers[i].timer, ulog_timer,
(unsigned long)&ulog->nlgroup[i]);
}
ulog->nflognl = netlink_kernel_create(net, NETLINK_NFLOG, &cfg);
if (!ulog->nflognl)