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eeprom: at24: check at24_read/write arguments

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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@gmail.com>
Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Heiner Kallweit 2017-11-24 07:47:50 +01:00 committed by Greg Kroah-Hartman
parent 5c65b73938
commit 6b4901e0e3
1 changed files with 6 additions and 0 deletions
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6
drivers/misc/eeprom/at24.c
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@ -257,6 +257,9 @@ static ssize_t at24_read(struct at24_data *at24,
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.
@ -311,6 +314,9 @@ static ssize_t at24_eeprom_write(struct at24_data *at24, const char *buf,
unsigned long timeout, write_time;
unsigned next_page;
if (offset + count > at24->chip.byte_len)
return -EINVAL;
/* Get corresponding I2C address and adjust offset */
client = at24_translate_offset(at24, &offset);