of_property command: Fix crash with empty property value

the of_property command crashes when an empty property value
was given. This is because xrealloc is called with a length
argument of 0. Fix this.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

1 files changed, 8 insertions, 2 deletions

diff --git a/commands/of_property.c b/commands/of_property.c
index bd9ff72fbc..1567a0f164 100644
--- a/commands/of_property.c
+++ b/commands/of_property.c
@@ -255,9 +255,15 @@ static int do_of_property(int argc, char *argv[])
 
 		if (pp) {
 			free(pp->value);
+
 			/* limit property data to the actual size */
-			data = xrealloc(data, len);
-			pp->value = data;
+			if (len) {
+				pp->value = xrealloc(data, len);
+			} else {
+				pp->value = NULL;
+				free(data);
+			}
+
 			pp->length = len;
 		} else {
 			pp = of_new_property(node, propname, data, len);