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| author | Manivannan Sadhasivam <mani@kernel.org> | 2025-07-03 16:05:49 +0530 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2025-07-10 16:03:05 +0200 |
| commit | 24418bc77a66cb5be9f5a837431ba3674ed8b52f (patch) | |
| tree | b4b7e464e6da0a90c9d6add9051a4330cc4a2ab2 /drivers/regulator | |
| parent | 0506547f6e3d2a1db4e3967975b65f46d12e331c (diff) | |
| download | linux-24418bc77a66cb5be9f5a837431ba3674ed8b52f.tar.gz linux-24418bc77a66cb5be9f5a837431ba3674ed8b52f.tar.bz2 linux-24418bc77a66cb5be9f5a837431ba3674ed8b52f.zip | |
regulator: gpio: Fix the out-of-bounds access to drvdata::gpiods
commit c9764fd88bc744592b0604ccb6b6fc1a5f76b4e3 upstream.
drvdata::gpiods is supposed to hold an array of 'gpio_desc' pointers. But
the memory is allocated for only one pointer. This will lead to
out-of-bounds access later in the code if 'config::ngpios' is > 1. So
fix the code to allocate enough memory to hold 'config::ngpios' of GPIO
descriptors.
While at it, also move the check for memory allocation failure to be below
the allocation to make it more readable.
Cc: stable@vger.kernel.org # 5.0
Fixes: d6cd33ad7102 ("regulator: gpio: Convert to use descriptors")
Signed-off-by: Manivannan Sadhasivam <mani@kernel.org>
Link: https://patch.msgid.link/20250703103549.16558-1-mani@kernel.org
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/regulator')
| -rw-r--r-- | drivers/regulator/gpio-regulator.c | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/drivers/regulator/gpio-regulator.c b/drivers/regulator/gpio-regulator.c index 65927fa2ef16..1bdd494cf882 100644 --- a/drivers/regulator/gpio-regulator.c +++ b/drivers/regulator/gpio-regulator.c @@ -260,8 +260,10 @@ static int gpio_regulator_probe(struct platform_device *pdev) return -ENOMEM; } - drvdata->gpiods = devm_kzalloc(dev, sizeof(struct gpio_desc *), - GFP_KERNEL); + drvdata->gpiods = devm_kcalloc(dev, config->ngpios, + sizeof(struct gpio_desc *), GFP_KERNEL); + if (!drvdata->gpiods) + return -ENOMEM; if (config->input_supply) { drvdata->desc.supply_name = devm_kstrdup(&pdev->dev, @@ -274,8 +276,6 @@ static int gpio_regulator_probe(struct platform_device *pdev) } } - if (!drvdata->gpiods) - return -ENOMEM; for (i = 0; i < config->ngpios; i++) { drvdata->gpiods[i] = devm_gpiod_get_index(dev, NULL, |