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 355430671ad93546b34b4e91bdf720f3a704efa4
"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>

diff --git a/net/ipv4/netfilter/ipt_ULOG.c b/net/ipv4/netfilter/ipt_ULOG.c
index ff4b781b1056e59937d44e9d751b6acf299d7a60..32b0e978c8e07efbb875fafbc15d7715003ec1d8 100644 (file)
--- a/net/ipv4/netfilter/ipt_ULOG.c
+++ b/net/ipv4/netfilter/ipt_ULOG.c
@@ -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)