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>
---
The issue is found by static analysis, and the patch remains untest.
---
v1->v2: Remove unused variable 'np'.
 drivers/regulator/stm32-pwr.c | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/drivers/regulator/stm32-pwr.c b/drivers/regulator/stm32-pwr.c
index 2a42acb7c24e..e5dd4db6403b 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;
-- 
2.34.1

On Wed, 12 Apr 2023 11:35:29 +0800, YAN SHI wrote:
> 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.
> 
> [...]

Applied to

   https://git.kernel.org/pub/scm/linux/kernel/git/broonie/regulator.git for-next

Thanks!

[1/1] Regulator: stm32-pwr: fix of_iomap leak
      commit: c4a413e56d16a2ae84e6d8992f215c4dcc7fac20

All being well this means that it will be integrated into the linux-next
tree (usually sometime in the next 24 hours) and sent to Linus during
the next merge window (or sooner if it is a bug fix), however if
problems are discovered then the patch may be dropped or reverted.

You may get further e-mails resulting from automated or manual testing
and review of the tree, please engage with people reporting problems and
send followup patches addressing any issues that are reported if needed.

If any updates are required or you are submitting further changes they
should be sent as incremental updates against current git, existing
patches will not be replaced.

Please add any relevant lists and maintainers to the CCs when replying
to this mail.

Thanks,
Mark