cgroup/cpuset: Fix retval in update_cpumask()

commit 25125a4762835d62ba1e540c1351d447fc1f6c7c upstream.

The update_cpumask(), checks for newly requested cpumask by calling
validate_change(), which returns an error on passing an invalid set
of cpu(s). Independent of the error returned, update_cpumask() always
returns zero, suppressing the error and returning success to the user
on writing an invalid cpu range for a cpuset. Fix it by returning
retval instead, which is returned by validate_change().

Fixes: 99fe36ba6fc1 ("cgroup/cpuset: Improve temporary cpumasks handling")
Signed-off-by: Kamalesh Babulal <kamalesh.babulal@oracle.com>
Reviewed-by: Waiman Long <longman@redhat.com>
Cc: stable@vger.kernel.org # v6.6+
Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/kernel/cgroup/cpuset.c b/kernel/cgroup/cpuset.c
index 4749e0c86c62c317a1a3bc6dc992ff97d0f2b4f2..1c2543edefeeb3ae0a9b191b2db71a6a0ed8fea9 100644 (file)
--- a/kernel/cgroup/cpuset.c
+++ b/kernel/cgroup/cpuset.c
@@ -1948,7 +1948,7 @@ static int update_cpumask(struct cpuset *cs, struct cpuset *trialcs,
        }
 out_free:
        free_cpumasks(NULL, &tmp);
-       return 0;
+       return retval;
 }
 
 /*