[Devel] [PATCH RHEL7 COMMIT] net: fix netns accounting on error handling

[Konstantin Khorenko]

The commit is pushed to "branch-rh7-3.10.0-862.14.4.vz7.72.x-ovz" and will appear at https://src.openvz.org/scm/ovz/vzkernel.git
after rh7-3.10.0-862.14.4.vz7.72.11
------>
commit a31646a53bd3c06fa9444c2af58ceff30025d10b
Author: Vasily Averin <vvs at virtuozzo.com>
Date:   Thu Oct 18 16:24:02 2018 +0300

    net: fix netns accounting on error handling
    
    Fixes: d0139b975f03 ("ve/netns: limit number of network namespaces per
    container")
    Signed-off-by: Vasily Averin <vvs at virtuozzo.com>
---
 net/core/net_namespace.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/net/core/net_namespace.c b/net/core/net_namespace.c
index 4a799a76f675..71c6881215e5 100644
--- a/net/core/net_namespace.c
+++ b/net/core/net_namespace.c
@@ -392,8 +392,10 @@ struct net *copy_net_ns(unsigned long flags,
 	if (!ucounts)
 		return ERR_PTR(-ENOSPC);
 
-	if (atomic_dec_if_positive(&ve->netns_avail_nr) < 0)
+	if (atomic_dec_if_positive(&ve->netns_avail_nr) < 0) {
+		dec_net_namespaces(ucounts);
 		return ERR_PTR(-ENOMEM);
+	}
 
 	net = net_alloc();
 	if (!net) {