From a233352506be35aafd49c0ba8c88ca96ebde1c3d Mon Sep 17 00:00:00 2001 From: Pavel Emelyanov Date: Wed, 26 Mar 2008 16:49:40 -0700 Subject: [PATCH] [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 Acked-by: Daniel Lezcano Signed-off-by: David S. Miller --- net/ipv6/route.c | 22 ++++++++++++++++++++-- 1 file changed, 20 insertions(+), 2 deletions(-) diff --git a/net/ipv6/route.c b/net/ipv6/route.c index ac4428371432..cd82b6db35ff 100644 --- a/net/ipv6/route.c +++ b/net/ipv6/route.c @@ -2390,10 +2390,18 @@ static int ipv6_route_show(struct seq_file *m, void *v) 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_show(struct seq_file *seq, void *v) 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) -- 2.30.2