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mfd: mt6360: Add bounds checking in Regmap read/write call-backs
Fix the potential risk of OOB read if bank index is over the maximum.
Refer to the discussion list for the experiment result on mt6370.
https://lore.kernel.org/all/20220914013345.GA5802@cyhuang-hp-elitebook-840-g3.rt/
If not to check the bound, there is the same issue on mt6360.
Cc: stable@vger.kernel.org
Fixes: 3b0850440a
(mfd: mt6360: Merge different sub-devices I2C read/write)
Signed-off-by: ChiYuan Huang <cy_huang@richtek.com>
Signed-off-by: Lee Jones <lee@kernel.org>
Link: https://lore.kernel.org/r/1664416817-31590-1-git-send-email-u0084500@gmail.com
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@ -402,7 +402,7 @@ static int mt6360_regmap_read(void *context, const void *reg, size_t reg_size,
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struct mt6360_ddata *ddata = context;
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u8 bank = *(u8 *)reg;
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u8 reg_addr = *(u8 *)(reg + 1);
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struct i2c_client *i2c = ddata->i2c[bank];
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struct i2c_client *i2c;
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bool crc_needed = false;
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u8 *buf;
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int buf_len = MT6360_ALLOC_READ_SIZE(val_size);
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@ -410,6 +410,11 @@ static int mt6360_regmap_read(void *context, const void *reg, size_t reg_size,
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u8 crc;
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int ret;
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if (bank >= MT6360_SLAVE_MAX)
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return -EINVAL;
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i2c = ddata->i2c[bank];
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if (bank == MT6360_SLAVE_PMIC || bank == MT6360_SLAVE_LDO) {
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crc_needed = true;
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ret = mt6360_xlate_pmicldo_addr(®_addr, val_size);
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@ -453,13 +458,18 @@ static int mt6360_regmap_write(void *context, const void *val, size_t val_size)
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struct mt6360_ddata *ddata = context;
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u8 bank = *(u8 *)val;
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u8 reg_addr = *(u8 *)(val + 1);
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struct i2c_client *i2c = ddata->i2c[bank];
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struct i2c_client *i2c;
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bool crc_needed = false;
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u8 *buf;
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int buf_len = MT6360_ALLOC_WRITE_SIZE(val_size);
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int write_size = val_size - MT6360_REGMAP_REG_BYTE_SIZE;
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int ret;
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if (bank >= MT6360_SLAVE_MAX)
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return -EINVAL;
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i2c = ddata->i2c[bank];
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if (bank == MT6360_SLAVE_PMIC || bank == MT6360_SLAVE_LDO) {
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crc_needed = true;
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ret = mt6360_xlate_pmicldo_addr(®_addr, val_size - MT6360_REGMAP_REG_BYTE_SIZE);
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