[PATCH] cgroup: simplify cleanup in cgroup_css_set_fork()

[Christian Brauner <brauner-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>]

The call that initializes kargs->cset is find_css_set() and it is the
last call in cgroup_css_set_fork(). If find_css_set() fails kargs->cset
is NULL and we go to the cleanup path where we check that kargs->cset is
non-NULL and if it is we call put_css_set(kargs->cset). But it'll always
be NULL so put_css_set(kargs->cset) is never hit. Remove it.

Fixes: ef2c41cf38a7 ("clone3: allow spawning processes into cgroups")
Reported-by: Al Viro <viro-RmSDqhL/yNMiFSDQTTA3OLVCufUGDwFn@public.gmane.org>
Signed-off-by: Christian Brauner (Microsoft) <brauner-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
---
 kernel/cgroup/cgroup.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/kernel/cgroup/cgroup.c b/kernel/cgroup/cgroup.c
index ffaccd6373f1..2ba516205057 100644
--- a/kernel/cgroup/cgroup.c
+++ b/kernel/cgroup/cgroup.c
@@ -6247,8 +6247,6 @@ static int cgroup_css_set_fork(struct kernel_clone_args *kargs)
 	if (dst_cgrp)
 		cgroup_put(dst_cgrp);
 	put_css_set(cset);
-	if (kargs->cset)
-		put_css_set(kargs->cset);
 	return ret;
 }
 

base-commit: 1c23f9e627a7b412978b4e852793c5e3c3efc555
-- 
2.34.1