[PATCH] param_enum: protect against invalid values

[Sascha Hauer]

Since dev_add_param_enum is passed a pointer containing the actual value
it can contain an invalid value. Protect against it so that we do not
access invalid array elements.

Signed-off-by: Sascha Hauer <s.hauer at pengutronix.de>
---
 lib/parameter.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/lib/parameter.c b/lib/parameter.c
index 0ac3b90..9e9f993 100644
--- a/lib/parameter.c
+++ b/lib/parameter.c
@@ -381,7 +381,7 @@ struct param_d *dev_add_param_int(struct device_d *dev, const char *name,
 
 struct param_enum {
 	struct param_d param;
-	int *value;
+	unsigned int *value;
 	const char * const *names;
 	int num_names;
 	int (*set)(struct param_d *p, void *priv);
@@ -433,7 +433,11 @@ static const char *param_enum_get(struct device_d *dev, struct param_d *p)
 	}
 
 	free(p->value);
-	p->value = strdup(pe->names[*pe->value]);
+
+	if (*pe->value >= pe->num_names)
+		p->value = asprintf("invalid:%d", *pe->value);
+	else
+		p->value = strdup(pe->names[*pe->value]);
 
 	return p->value;
 }
-- 
2.1.4