Staging: iio-utils: fix memory overflow for dynamically allocateded m…

…emory to hold filename

Signed-off-by: Barry Song <21cnbao@gmail.com>
Acked-by: Jonathan Cameron <jic23@cam.ac.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/staging/iio/Documentation/iio_utils.h

@@ -62,9 +62,8 @@ inline int find_type_by_name(const char *name, const char *type)
 					1) != 0) {
 				filename = malloc(strlen(iio_dir)
 						+ strlen(type)
-						+ 1
 						+ numstrlen
-						+ 1);
+						+ 6);
 				if (filename == NULL)
 					return -ENOMEM;
 				sprintf(filename, "%s%s%d/name",