From: Andrea Righi <arighi@nvidia.com>
Date: Wed, 29 Oct 2025 13:08:43 +0000 (+0100)
Subject: sched_ext: Fix use of uninitialized variable in scx_bpf_cpuperf_set()
X-Git-Tag: v6.18-rc7~33^2~4
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=f4fa7c25f632cd925352b4d46f245653a23b1d1a;p=thirdparty%2Flinux.git

sched_ext: Fix use of uninitialized variable in scx_bpf_cpuperf_set()

scx_bpf_cpuperf_set() has a typo where it dereferences the local
variable @sch, instead of the global @scx_root pointer. Fix by
dereferencing the correct variable.

Fixes: 956f2b11a8a4f ("sched_ext: Drop kf_cpu_valid()")
Signed-off-by: Andrea Righi <arighi@nvidia.com>
Reviewed-by: Christian Loehle <christian.loehle@arm.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
---

diff --git a/kernel/sched/ext.c b/kernel/sched/ext.c
index ecb251e883eab..1a019a7728fb2 100644
--- a/kernel/sched/ext.c
+++ b/kernel/sched/ext.c
@@ -6401,7 +6401,7 @@ __bpf_kfunc void scx_bpf_cpuperf_set(s32 cpu, u32 perf)
 
 	guard(rcu)();
 
-	sch = rcu_dereference(sch);
+	sch = rcu_dereference(scx_root);
 	if (unlikely(!sch))
 		return;