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regulator: rt5759: fix OOB in validate_desc()
[ Upstream commit7920e0fbce
] I got the following OOB report: BUG: KASAN: slab-out-of-bounds in validate_desc+0xba/0x109 Read of size 8 at addr ffff888107db8ff0 by task python3/253 Call Trace: <TASK> dump_stack_lvl+0x67/0x83 print_report+0x178/0x4b0 kasan_report+0x90/0x190 validate_desc+0xba/0x109 gpiod_set_value_cansleep+0x40/0x5a regulator_ena_gpio_ctrl+0x93/0xfc _regulator_do_enable.cold.61+0x89/0x163 set_machine_constraints+0x140a/0x159c regulator_register.cold.73+0x762/0x10cd devm_regulator_register+0x57/0xb0 rt5759_probe+0x3a0/0x4ac [rt5759_regulator] The desc used in validate_desc() is passed from 'reg_cfg.ena_gpiod', which is not initialized. Fix this by initializing 'reg_cfg' to 0. Fixes:7b36ddb208
("regulator: rt5759: Add support for Richtek RT5759 DCDC converter") Signed-off-by: Yang Yingliang <yangyingliang@huawei.com> Link: https://lore.kernel.org/r/20221116092943.1668326-1-yangyingliang@huawei.com Signed-off-by: Mark Brown <broonie@kernel.org> Signed-off-by: Sasha Levin <sashal@kernel.org>
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@ -243,6 +243,7 @@ static int rt5759_regulator_register(struct rt5759_priv *priv)
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if (priv->chip_type == CHIP_TYPE_RT5759A)
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reg_desc->uV_step = RT5759A_STEP_UV;
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memset(®_cfg, 0, sizeof(reg_cfg));
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reg_cfg.dev = priv->dev;
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reg_cfg.of_node = np;
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reg_cfg.init_data = of_get_regulator_init_data(priv->dev, np, reg_desc);
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