linux-kernel - [PATCH] cpufreq: qcom-hw: fix dereferencing freed memory 'data'

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Date:   Sun, 28 Feb 2021 09:33:19 +0800
From:   Shawn Guo <shawn.guo@...aro.org>
To:     Viresh Kumar <viresh.kumar@...aro.org>
Cc:     linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org,
        Shawn Guo <shawn.guo@...aro.org>
Subject: [PATCH] cpufreq: qcom-hw: fix dereferencing freed memory 'data'

Commit 67fc209b527d ("cpufreq: qcom-hw: drop devm_xxx() calls from
init/exit hooks") introduces an issue of dereferencing freed memory
'data'.  Fix it.

Fixes: 67fc209b527d ("cpufreq: qcom-hw: drop devm_xxx() calls from init/exit hooks")
Reported-by: kernel test robot <lkp@...el.com>
Reported-by: Dan Carpenter <dan.carpenter@...cle.com>
Signed-off-by: Shawn Guo <shawn.guo@...aro.org>
---
Viresh,

The issue was introduced by v2 of "cpufreq: qcom-hw: drop devm_xxx()
calls from init/exit hooks", which misses the conversion of 'data->base'
in error path.  Sorry!

Shawn

 drivers/cpufreq/qcom-cpufreq-hw.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/cpufreq/qcom-cpufreq-hw.c b/drivers/cpufreq/qcom-cpufreq-hw.c
index d3c23447b892..bee5d67a8227 100644
--- a/drivers/cpufreq/qcom-cpufreq-hw.c
+++ b/drivers/cpufreq/qcom-cpufreq-hw.c
@@ -374,7 +374,7 @@ static int qcom_cpufreq_hw_cpu_init(struct cpufreq_policy *policy)
 error:
 	kfree(data);
 unmap_base:
-	iounmap(data->base);
+	iounmap(base);
 release_region:
 	release_mem_region(res->start, resource_size(res));
 	return ret;
-- 
2.17.1