linux-kernel - [PATCH] time/timgr: Fix wrong reference when level 0 group allocation failed

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Date: Wed,  1 May 2024 20:51:16 +0100
From: Levi Yun <ppbuk5246@...il.com>
To: anna-maria@...utronix.de,
	frederic@...nel.org,
	tglx@...utronix.de
Cc: linux-kernel@...r.kernel.org,
	Levi Yun <ppbuk5246@...il.com>
Subject: [PATCH] time/timgr: Fix wrong reference when level 0 group allocation failed

When tmigr_setup_groups() failed level 0 group allocation,
next do while loop refers wrong local stack array location.

Changing group init do while loop with while loop to fix this problem.

Signed-off-by: Levi Yun <ppbuk5246@...il.com>
---
 kernel/time/timer_migration.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/kernel/time/timer_migration.c b/kernel/time/timer_migration.c
index ccba875d2234..84413114db5c 100644
--- a/kernel/time/timer_migration.c
+++ b/kernel/time/timer_migration.c
@@ -1596,7 +1596,7 @@ static int tmigr_setup_groups(unsigned int cpu, unsigned int node)
 
 	} while (i < tmigr_hierarchy_levels);
 
-	do {
+	while (i > 0) {
 		group = stack[--i];
 
 		if (err < 0) {
@@ -1645,7 +1645,7 @@ static int tmigr_setup_groups(unsigned int cpu, unsigned int node)
 				tmigr_connect_child_parent(child, group);
 			}
 		}
-	} while (i > 0);
+	}
 
 	kfree(stack);
 
-- 
2.41.0