netfilter: arp_tables: fix infoleak to userspace

[linux-flexiantxendom0-natty.git] / net / ipv4 / netfilter / arp_tables.c

diff --git a/net/ipv4/netfilter/arp_tables.c b/net/ipv4/netfilter/arp_tables.c
index e855fff..6d79aa1 100644 (file)
--- a/net/ipv4/netfilter/arp_tables.c
+++ b/net/ipv4/netfilter/arp_tables.c
@@ -1065,6 +1065,7 @@ static int do_replace(struct net *net, const void __user *user,
        /* overflow check */
        if (tmp.num_counters >= INT_MAX / sizeof(struct xt_counters))
                return -ENOMEM;
+       tmp.name[sizeof(tmp.name)-1] = 0;
 
        newinfo = xt_alloc_table_info(tmp.size);
        if (!newinfo)
@@ -1486,6 +1487,7 @@ static int compat_do_replace(struct net *net, void __user *user,
                return -ENOMEM;
        if (tmp.num_counters >= INT_MAX / sizeof(struct xt_counters))
                return -ENOMEM;
+       tmp.name[sizeof(tmp.name)-1] = 0;
 
        newinfo = xt_alloc_table_info(tmp.size);
        if (!newinfo)
@@ -1738,6 +1740,7 @@ static int do_arpt_get_ctl(struct sock *sk, int cmd, void __user *user, int *len
                        ret = -EFAULT;
                        break;
                }
+               rev.name[sizeof(rev.name)-1] = 0;
 
                try_then_request_module(xt_find_revision(NFPROTO_ARP, rev.name,
                                                         rev.revision, 1, &ret),