linux-kernel - [PATCH resend] ab3100: fix off-by-one value range checking for voltage selector

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Date:	Mon, 26 Jul 2010 15:34:14 +0800
From:	Axel Lin <axel.lin@...il.com>
To:	linux-kernel <linux-kernel@...r.kernel.org>
Cc:	Liam Girdwood <lrg@...mlogic.co.uk>,
	Mark Brown <broonie@...nsource.wolfsonmicro.com>,
	Linus Walleij <linus.walleij@...ricsson.com>,
	Mattias Wallin <mattias.wallin@...ricsson.com>
Subject: [PATCH resend] ab3100: fix off-by-one value range checking for
	voltage selector

We use voltage selector as an array index for typ_voltages.
Thus the valid range for voltage selector should be 0..voltages_len-1.

Signed-off-by: Axel Lin <axel.lin@...il.com>
Acked-by: Mark Brown <broonie@...nsource.wolfsonmicro.com>
---
Simply update the changelog explaining that the reason for the limit is that it's an array index.

 drivers/regulator/ab3100.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/regulator/ab3100.c b/drivers/regulator/ab3100.c
index 7b14a67..1179099 100644
--- a/drivers/regulator/ab3100.c
+++ b/drivers/regulator/ab3100.c
@@ -286,7 +286,7 @@ static int ab3100_list_voltage_regulator(struct regulator_dev *reg,
 {
 	struct ab3100_regulator *abreg = reg->reg_data;
 
-	if (selector > abreg->voltages_len)
+	if (selector >= abreg->voltages_len)
 		return -EINVAL;
 	return abreg->typ_voltages[selector];
 }
@@ -318,7 +318,7 @@ static int ab3100_get_voltage_regulator(struct regulator_dev *reg)
 	regval &= 0xE0;
 	regval >>= 5;
 
-	if (regval > abreg->voltages_len) {
+	if (regval >= abreg->voltages_len) {
 		dev_err(&reg->dev,
 			"regulator register %02x contains an illegal voltage setting\n",
 			abreg->regreg);
-- 
1.5.4.3



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