linux-kernel - [PATCH 4/5] pinctrl: dynamically alloc temp array when parsing dt pinconf options

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Date:	Fri, 14 Jun 2013 17:43:55 +0200
From:	Heiko Stübner <heiko@...ech.de>
To:	Linus Walleij <linus.walleij@...aro.org>
Cc:	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Grant Likely <grant.likely@...aro.org>,
	rob.herring@...xeda.com, devicetree-discuss@...ts.ozlabs.org,
	James Hogan <james.hogan@...tec.com>,
	Laurent Pinchart <laurent.pinchart@...asonboard.com>
Subject: [PATCH 4/5] pinctrl: dynamically alloc temp array when parsing dt pinconf options

Allocating the temorary array in pinconf_generic_parse_dt_config on stack
might cause problems later on, when the number of options grows over time.
Therefore also allocate this array dynamically to be on the safe side.

Suggested-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>
Signed-off-by: Heiko Stuebner <heiko@...ech.de>
---
 drivers/pinctrl/pinconf-generic.c |   24 ++++++++++++++++++------
 1 file changed, 18 insertions(+), 6 deletions(-)

diff --git a/drivers/pinctrl/pinconf-generic.c b/drivers/pinctrl/pinconf-generic.c
index ea9da17..794dad7 100644
--- a/drivers/pinctrl/pinconf-generic.c
+++ b/drivers/pinctrl/pinconf-generic.c
@@ -182,7 +182,7 @@ int pinconf_generic_parse_dt_config(struct device_node *np,
 				    unsigned long **configs,
 				    unsigned int *nconfigs)
 {
-	unsigned long cfg[ARRAY_SIZE(dt_params)];
+	unsigned long *cfg;
 	unsigned int ncfg = 0;
 	int ret;
 	int i;
@@ -191,6 +191,11 @@ int pinconf_generic_parse_dt_config(struct device_node *np,
 	if (!np)
 		return -EINVAL;
 
+	/* allocate a temporary array big enough to hold one of each option */
+	cfg = kzalloc(sizeof(*cfg) * ARRAY_SIZE(dt_params), GFP_KERNEL);
+	if (!cfg)
+		return -ENOMEM;
+
 	for (i = 0; i < ARRAY_SIZE(dt_params); i++) {
 		struct pinconf_generic_dt_params *par = &dt_params[i];
 		ret = of_property_read_u32(np, par->property, &val);
@@ -208,11 +213,13 @@ int pinconf_generic_parse_dt_config(struct device_node *np,
 		ncfg++;
 	}
 
+	ret = 0;
+
 	/* no configs found at all */
 	if (ncfg == 0) {
 		*configs = NULL;
 		*nconfigs = 0;
-		return 0;
+		goto out;
 	}
 
 	/*
@@ -220,11 +227,16 @@ int pinconf_generic_parse_dt_config(struct device_node *np,
 	 * found properties.
 	 */
 	*configs = kzalloc(ncfg * sizeof(unsigned long), GFP_KERNEL);
-	if (!*configs)
-		return -ENOMEM;
+	if (!*configs) {
+		ret = -ENOMEM;
+		goto out;
+	}
 
-	memcpy(*configs, &cfg, ncfg * sizeof(unsigned long));
+	memcpy(*configs, cfg, ncfg * sizeof(unsigned long));
 	*nconfigs = ncfg;
-	return 0;
+
+out:
+	kfree(cfg);
+	return ret;
 }
 #endif
-- 
1.7.10.4

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