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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 d3da2efa6d
commit 19699abea3
1 changed files with 6 additions and 0 deletions
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6
drivers/misc/eeprom/at24.c
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@ -507,6 +507,9 @@ static int at24_read(void *priv, unsigned int off, void *val, size_t count)
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, unsigned int off, void *val, size_t count)
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.