4.9-stable review patch. If anyone has any objections, please let me know. ------------------ From: Heiner Kallweit <hkallweit1@xxxxxxxxx> commit d9bcd462daf34aebb8de9ad7f76de0198bb5a0f0 upstream. So far we completely rely on the caller to provide valid arguments. To be on the safe side perform an own sanity check. Signed-off-by: Heiner Kallweit <hkallweit1@xxxxxxxxx> Signed-off-by: Bartosz Golaszewski <brgl@xxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/misc/eeprom/at24.c | 6 ++++++ 1 file changed, 6 insertions(+) --- a/drivers/misc/eeprom/at24.c +++ b/drivers/misc/eeprom/at24.c @@ -507,6 +507,9 @@ static int at24_read(void *priv, unsigne if (unlikely(!count)) return count; + if (off + count > at24->chip.byte_len) + return -EINVAL; + /* * Read data from chip, protecting against concurrent updates * from this host, but not from other I2C masters. @@ -539,6 +542,9 @@ static int at24_write(void *priv, unsign if (unlikely(!count)) return -EINVAL; + if (off + count > at24->chip.byte_len) + return -EINVAL; + /* * Write data to chip, protecting against concurrent updates * from this host, but not from other I2C masters.