From 45efe847971e6274a04eea75a0745d8015b54d37 Mon Sep 17 00:00:00 2001
From: Wolfram Sang <w.sang@pengutronix.de>
Date: Wed, 17 Nov 2010 13:00:49 +0100
Subject: 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 @@ static int at24_probe(struct i2c_client *client, const struct i2c_device_id *id)
 	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 struct i2c_driver at24_driver = {
 
 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);
 }
-- 
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