[IPV6]: Fix potential net leak and oops in ipv6 routing code.
The commits f3db4851 ([NETNS][IPV6] ip6_fib - fib6_clean_all handle several
network namespaces) and 69ddb805 ([NETNS][IPV6] route6 - Make proc entry
/proc/net/rt6_stats per namespace) made some proc files per net.
Both of them introduced potential OOPS - get_proc_net can return NULL, but
this check is lost - and a struct net leak - in case single_open() fails the
previously got net is not put.
Kill all these bugs with one patch.
Signed-off-by: Pavel Emelyanov <xemul@openvz.org>
Acked-by: Daniel Lezcano <dlezcano@fr.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index ac44283..cd82b6d 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -2390,10 +2390,18 @@
static int ipv6_route_open(struct inode *inode, struct file *file)
{
+ int err;
struct net *net = get_proc_net(inode);
if (!net)
return -ENXIO;
- return single_open(file, ipv6_route_show, net);
+
+ err = single_open(file, ipv6_route_show, net);
+ if (err < 0) {
+ put_net(net);
+ return err;
+ }
+
+ return 0;
}
static int ipv6_route_release(struct inode *inode, struct file *file)
@@ -2429,8 +2437,18 @@
static int rt6_stats_seq_open(struct inode *inode, struct file *file)
{
+ int err;
struct net *net = get_proc_net(inode);
- return single_open(file, rt6_stats_seq_show, net);
+ if (!net)
+ return -ENXIO;
+
+ err = single_open(file, rt6_stats_seq_show, net);
+ if (err < 0) {
+ put_net(net);
+ return err;
+ }
+
+ return 0;
}
static int rt6_stats_seq_release(struct inode *inode, struct file *file)