[PATCH 3.13 078/172] cgroup: fix error return value in cgroup_mount()

[Greg Kroah-Hartman]

3.13-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Tejun Heo <tj@xxxxxxxxxx>

commit eb46bf89696972b856a9adb6aebd5c7b65c266e4 upstream.

When cgroup_mount() fails to allocate an id for the root, it didn't
set ret before jumping to unlock_drop ending up returning 0 after a
failure.  Fix it.

Signed-off-by: Tejun Heo <tj@xxxxxxxxxx>
Acked-by: Li Zefan <lizefan@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 kernel/cgroup.c |    6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

--- a/kernel/cgroup.c
+++ b/kernel/cgroup.c
@@ -1580,10 +1580,10 @@ static struct dentry *cgroup_mount(struc
 		mutex_lock(&cgroup_mutex);
 		mutex_lock(&cgroup_root_mutex);
 
-		root_cgrp->id = idr_alloc(&root->cgroup_idr, root_cgrp,
-					   0, 1, GFP_KERNEL);
-		if (root_cgrp->id < 0)
+		ret = idr_alloc(&root->cgroup_idr, root_cgrp, 0, 1, GFP_KERNEL);
+		if (ret < 0)
 			goto unlock_drop;
+		root_cgrp->id = ret;
 
 		/* Check for name clashes with existing mounts */
 		ret = -EBUSY;


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