misc/at24: add more sanity checks for parameters
Side-effects happen when passing 0 to either io_limit or page_size. Give
an error in case of this misconfiguration.
Signed-off-by: Wolfram Sang <w.sang@pengutronix.de>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
diff --git a/drivers/misc/eeprom/at24.c b/drivers/misc/eeprom/at24.c
index 3a53efc..ab1ad41 100644
--- a/drivers/misc/eeprom/at24.c
+++ b/drivers/misc/eeprom/at24.c
@@ -517,6 +517,11 @@
if (!is_power_of_2(chip.byte_len))
dev_warn(&client->dev,
"byte_len looks suspicious (no power of 2)!\n");
+ if (!chip.page_size) {
+ dev_err(&client->dev, "page_size must not be 0!\n");
+ err = -EINVAL;
+ goto err_out;
+ }
if (!is_power_of_2(chip.page_size))
dev_warn(&client->dev,
"page_size looks suspicious (no power of 2)!\n");
@@ -681,6 +686,11 @@
static int __init at24_init(void)
{
+ if (!io_limit) {
+ pr_err("at24: io_limit must not be 0!\n");
+ return -EINVAL;
+ }
+
io_limit = rounddown_pow_of_two(io_limit);
return i2c_add_driver(&at24_driver);
}