linux-kernel - [PATCH] pinctrl: lpc18xx: ensure ngroups is initialized at correct place

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Message-Id: <1456335170-20718-1-git-send-email-colin.king@canonical.com>
Date:	Wed, 24 Feb 2016 17:32:50 +0000
From:	Colin King <colin.king@...onical.com>
To:	Linus Walleij <linus.walleij@...aro.org>,
	Joachim Eastwood <manabian@...il.com>,
	linux-gpio@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Cc:	linux-kernel@...r.kernel.org
Subject: [PATCH] pinctrl: lpc18xx: ensure ngroups is initialized at correct place

From: Colin Ian King <colin.king@...onical.com>

The initialization of ngroups is occurring at the end of the
first iteration of the outer loop, which means that the
assignment  pins[ngroups++] = i is potentially indexing into
a region outside of array pins because ngroups is not initialized.
Instead, initialize ngroups in the inner loop before the first
inner loop iteration.

Signed-off-by: Colin Ian King <colin.king@...onical.com>
---
 drivers/pinctrl/pinctrl-lpc18xx.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/drivers/pinctrl/pinctrl-lpc18xx.c b/drivers/pinctrl/pinctrl-lpc18xx.c
index f0bebbe..ed1cfa7 100644
--- a/drivers/pinctrl/pinctrl-lpc18xx.c
+++ b/drivers/pinctrl/pinctrl-lpc18xx.c
@@ -1170,9 +1170,8 @@ static int lpc18xx_create_group_func_map(struct device *dev,
 	u16 pins[ARRAY_SIZE(lpc18xx_pins)];
 	int func, ngroups, i;
 
-	for (func = 0; func < FUNC_MAX; ngroups = 0, func++) {
-
-		for (i = 0; i < ARRAY_SIZE(lpc18xx_pins); i++) {
+	for (func = 0; func < FUNC_MAX; func++) {
+		for (ngroups = 0, i = 0; i < ARRAY_SIZE(lpc18xx_pins); i++) {
 			if (lpc18xx_valid_pin_function(i, func))
 				pins[ngroups++] = i;
 		}
-- 
2.7.0