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| author | YAN SHI <m202071378@hust.edu.cn> | 2023-04-12 11:35:29 +0800 |
|---|---|---|
| committer | Mark Brown <broonie@kernel.org> | 2023-04-12 12:52:14 +0100 |
| commit | c4a413e56d16a2ae84e6d8992f215c4dcc7fac20 (patch) | |
| tree | 51f6bb29b69ff467733c8e3ddc8364f1d07c239c /drivers/regulator | |
| parent | 53e59b5c4645236f0014d3cc5c24bc71ad3f6120 (diff) | |
| download | lwn-c4a413e56d16a2ae84e6d8992f215c4dcc7fac20.tar.gz lwn-c4a413e56d16a2ae84e6d8992f215c4dcc7fac20.zip | |
regulator: stm32-pwr: fix of_iomap leak
Smatch reports:
drivers/regulator/stm32-pwr.c:166 stm32_pwr_regulator_probe() warn:
'base' from of_iomap() not released on lines: 151,166.
In stm32_pwr_regulator_probe(), base is not released
when devm_kzalloc() fails to allocate memory or
devm_regulator_register() fails to register a new regulator device,
which may cause a leak.
To fix this issue, replace of_iomap() with
devm_platform_ioremap_resource(). devm_platform_ioremap_resource()
is a specialized function for platform devices.
It allows 'base' to be automatically released whether the probe
function succeeds or fails.
Besides, use IS_ERR(base) instead of !base
as the return value of devm_platform_ioremap_resource()
can either be a pointer to the remapped memory or
an ERR_PTR() encoded error code if the operation fails.
Fixes: dc62f951a6a8 ("regulator: stm32-pwr: Fix return value check in stm32_pwr_regulator_probe()")
Signed-off-by: YAN SHI <m202071378@hust.edu.cn>
Reported-by: kernel test robot <lkp@intel.com>
Link: https://lore.kernel.org/oe-kbuild-all/202304111750.o2643eJN-lkp@intel.com/
Reviewed-by: Dongliang Mu <dzm91@hust.edu.cn>
Link: https://lore.kernel.org/r/20230412033529.18890-1-m202071378@hust.edu.cn
Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'drivers/regulator')
| -rw-r--r-- | drivers/regulator/stm32-pwr.c | 7 |
1 files changed, 3 insertions, 4 deletions
diff --git a/drivers/regulator/stm32-pwr.c b/drivers/regulator/stm32-pwr.c index 2803a199826f..68aa9d92953d 100644 --- a/drivers/regulator/stm32-pwr.c +++ b/drivers/regulator/stm32-pwr.c @@ -129,17 +129,16 @@ static const struct regulator_desc stm32_pwr_desc[] = { static int stm32_pwr_regulator_probe(struct platform_device *pdev) { - struct device_node *np = pdev->dev.of_node; struct stm32_pwr_reg *priv; void __iomem *base; struct regulator_dev *rdev; struct regulator_config config = { }; int i, ret = 0; - base = of_iomap(np, 0); - if (!base) { + base = devm_platform_ioremap_resource(pdev, 0); + if (IS_ERR(base)) { dev_err(&pdev->dev, "Unable to map IO memory\n"); - return -ENOMEM; + return PTR_ERR(base); } config.dev = &pdev->dev; |