linux-kernel - [PATCH 0/2] cpufreq: qcom-nvmem: fix memory leaks and add auto device node cleanup

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Message-Id: <20240523-qcom-cpufreq-nvmem_memleak-v1-0-e57795c7afa7@gmail.com>
Date: Thu, 23 May 2024 23:24:58 +0200
From: Javier Carrasco <javier.carrasco.cruz@...il.com>
To: Ilia Lin <ilia.lin@...nel.org>, "Rafael J. Wysocki" <rafael@...nel.org>, 
 Viresh Kumar <viresh.kumar@...aro.org>
Cc: linux-arm-msm@...r.kernel.org, linux-pm@...r.kernel.org, 
 linux-kernel@...r.kernel.org, 
 Javier Carrasco <javier.carrasco.cruz@...il.com>, stable@...r.kernel.org
Subject: [PATCH 0/2] cpufreq: qcom-nvmem: fix memory leaks and add auto
 device node cleanup

There are a number of error paths in the probe function that do not call
of_node_put() to decrement the np device node refcount, leading to
memory leaks if those errors occur.

In order to ease backporting, the fix has been divided into two patches:
the first one simply adds the missing calls to of_node_put(), and the
second one adds the __free() macro to the existing device nodes to
remove the need for of_node_put(), ensuring that the same bug will not
arise in the future.

The issue was found by chance while analyzing the code, and I do not
have the hardware to test it beyond compiling and static analysis tools.
Although the issue is clear and the fix too, if someone wants to
volunteer to test the series with real hardware, it would be great.

Signed-off-by: Javier Carrasco <javier.carrasco.cruz@...il.com>
---
Javier Carrasco (2):
      cpufreq: qcom-nvmem: fix memory leaks in probe error paths
      cpufreq: qcom-nvmem: eliminate uses of of_node_put()

 drivers/cpufreq/qcom-cpufreq-nvmem.c | 12 ++++--------
 1 file changed, 4 insertions(+), 8 deletions(-)
---
base-commit: 3689b0ef08b70e4e03b82ebd37730a03a672853a
change-id: 20240523-qcom-cpufreq-nvmem_memleak-6b6821db52b1

Best regards,
-- 
Javier Carrasco <javier.carrasco.cruz@...il.com>