linux-kernel - [PATCH] sched/uclamp: potential dereference of null pointer

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Message-Id: <20211209033127.2051504-1-jiasheng@iscas.ac.cn>
Date:   Thu,  9 Dec 2021 11:31:27 +0800
From:   Jiasheng Jiang <jiasheng@...as.ac.cn>
To:     mingo@...hat.com, peterz@...radead.org, juri.lelli@...hat.com,
        vincent.guittot@...aro.org, dietmar.eggemann@....com,
        rostedt@...dmis.org, bsegall@...gle.com, mgorman@...e.de,
        bristot@...hat.com
Cc:     linux-kernel@...r.kernel.org, Jiasheng Jiang <jiasheng@...as.ac.cn>
Subject: [PATCH] sched/uclamp: potential dereference of null pointer

The return value of kzalloc() needs to be checked.
To avoid use of null pointer in case of the failure of alloc.

Fixes: 391e43da797a ("sched: Move all scheduler bits into kernel/sched/")
Signed-off-by: Jiasheng Jiang <jiasheng@...as.ac.cn>
---
 kernel/sched/core.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index e5858999b54d..988a4a372e14 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -8125,6 +8125,8 @@ void __init sched_init(void)
 #endif
 	if (ptr) {
 		ptr = (unsigned long)kzalloc(ptr, GFP_NOWAIT);
+		if (!ptr)
+			return;
 
 #ifdef CONFIG_FAIR_GROUP_SCHED
 		root_task_group.se = (struct sched_entity **)ptr;
-- 
2.25.1