eeprom: at24: check at24_read/write arguments
So far we completely rely on the caller to provide valid arguments.
To be on the safe side perform an own sanity check.
Cc: stable@vger.kernel.org
Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl>
diff --git a/drivers/misc/eeprom/at24.c b/drivers/misc/eeprom/at24.c
index 8ca6772..305a7a4 100644
--- a/drivers/misc/eeprom/at24.c
+++ b/drivers/misc/eeprom/at24.c
@@ -569,6 +569,9 @@ 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;
+
client = at24_translate_offset(at24, &off);
ret = pm_runtime_get_sync(&client->dev);
@@ -614,6 +617,9 @@ 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;
+
client = at24_translate_offset(at24, &off);
ret = pm_runtime_get_sync(&client->dev);