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| author | ChiYuan Huang <cy_huang@richtek.com> | 2022-09-29 10:00:17 +0800 |
|---|---|---|
| committer | Lee Jones <lee@kernel.org> | 2022-12-07 13:28:08 +0000 |
| commit | 5f4f94e9f26cca6514474b307b59348b8485e711 (patch) | |
| tree | e1c6dd717551e949348500fbffc006e11d36dcdd /drivers/mfd/mt6360-core.c | |
| parent | 4bef4d519b01cf15818b81a3fbf62d9f51612ad3 (diff) | |
| download | linux-5f4f94e9f26cca6514474b307b59348b8485e711.tar.gz linux-5f4f94e9f26cca6514474b307b59348b8485e711.tar.bz2 linux-5f4f94e9f26cca6514474b307b59348b8485e711.zip | |
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: 3b0850440a06c (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
Diffstat (limited to 'drivers/mfd/mt6360-core.c')
| -rw-r--r-- | drivers/mfd/mt6360-core.c | 14 |
1 files changed, 12 insertions, 2 deletions
diff --git a/drivers/mfd/mt6360-core.c b/drivers/mfd/mt6360-core.c index 6eaa6775b888..d3b32eb79837 100644 --- a/drivers/mfd/mt6360-core.c +++ b/drivers/mfd/mt6360-core.c @@ -402,7 +402,7 @@ static int mt6360_regmap_read(void *context, const void *reg, size_t reg_size, struct mt6360_ddata *ddata = context; u8 bank = *(u8 *)reg; u8 reg_addr = *(u8 *)(reg + 1); - struct i2c_client *i2c = ddata->i2c[bank]; + struct i2c_client *i2c; bool crc_needed = false; u8 *buf; int buf_len = MT6360_ALLOC_READ_SIZE(val_size); @@ -410,6 +410,11 @@ static int mt6360_regmap_read(void *context, const void *reg, size_t reg_size, u8 crc; int ret; + if (bank >= MT6360_SLAVE_MAX) + return -EINVAL; + + i2c = ddata->i2c[bank]; + if (bank == MT6360_SLAVE_PMIC || bank == MT6360_SLAVE_LDO) { crc_needed = true; ret = mt6360_xlate_pmicldo_addr(®_addr, val_size); @@ -453,13 +458,18 @@ static int mt6360_regmap_write(void *context, const void *val, size_t val_size) struct mt6360_ddata *ddata = context; u8 bank = *(u8 *)val; u8 reg_addr = *(u8 *)(val + 1); - struct i2c_client *i2c = ddata->i2c[bank]; + struct i2c_client *i2c; bool crc_needed = false; u8 *buf; int buf_len = MT6360_ALLOC_WRITE_SIZE(val_size); int write_size = val_size - MT6360_REGMAP_REG_BYTE_SIZE; int ret; + if (bank >= MT6360_SLAVE_MAX) + return -EINVAL; + + i2c = ddata->i2c[bank]; + if (bank == MT6360_SLAVE_PMIC || bank == MT6360_SLAVE_LDO) { crc_needed = true; ret = mt6360_xlate_pmicldo_addr(®_addr, val_size - MT6360_REGMAP_REG_BYTE_SIZE); |