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Input: mtk-pmic-keys - fix possible null pointer dereference

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commit 11cdb506d0 upstream.

In mtk_pmic_keys_probe, the regs parameter is only set if the button is
parsed in the device tree. However, on hardware where the button is left
floating, that node will most likely be removed not to enable that
input. In that case the code will try to dereference a null pointer.

Let's use the regs struct instead as it is defined for all supported
platforms. Note that it is ok setting the key reg even if that latter is
disabled as the interrupt won't be enabled anyway.

Fixes: b581acb49a ("Input: mtk-pmic-keys - transfer per-key bit in mtk_pmic_keys_regs")
Signed-off-by: Gary Bisson <bisson.gary@gmail.com>
Cc: stable@vger.kernel.org
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Gary Bisson
2025-04-29 09:16:29 -07:00
committed by Greg Kroah-Hartman
parent f72f017207
commit 90fa6015ff
1 changed files with 2 additions and 2 deletions
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drivers/input/keyboard/mtk-pmic-keys.c
+2 -2
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@@ -147,8 +147,8 @@ static void mtk_pmic_keys_lp_reset_setup(struct mtk_pmic_keys *keys,
u32 value, mask;
int error;
kregs_home = keys->keys[MTK_PMIC_HOMEKEY_INDEX].regs;
kregs_pwr = keys->keys[MTK_PMIC_PWRKEY_INDEX].regs;
kregs_home = &regs->keys_regs[MTK_PMIC_HOMEKEY_INDEX];
kregs_pwr = &regs->keys_regs[MTK_PMIC_PWRKEY_INDEX];
error = of_property_read_u32(keys->dev->of_node, "power-off-time-sec",
&long_press_debounce);