[PATCH v2 1/3] lib: parse_area_spec: don't modify *start value if parse failed

[Peter Mamonov]

Signed-off-by: Peter Mamonov <pmamonov at gmail.com>
---
 lib/misc.c | 14 +++++++++-----
 1 file changed, 9 insertions(+), 5 deletions(-)

diff --git a/lib/misc.c b/lib/misc.c
index 62ddd6677..1767043d1 100644
--- a/lib/misc.c
+++ b/lib/misc.c
@@ -79,19 +79,19 @@ EXPORT_SYMBOL(strtoul_suffix);
 int parse_area_spec(const char *str, loff_t *start, loff_t *size)
 {
 	char *endp;
-	loff_t end;
+	loff_t end, _start;
 
 	if (!isdigit(*str))
 		return -1;
 
-	*start = strtoull_suffix(str, &endp, 0);
+	_start = strtoull_suffix(str, &endp, 0);
 
 	str = endp;
 
 	if (!*str) {
 		/* beginning given, but no size, assume maximum size */
 		*size = ~0;
-		return 0;
+		goto success;
 	}
 
 	if (*str == '-') {
@@ -102,15 +102,19 @@ int parse_area_spec(const char *str, loff_t *start, loff_t *size)
 			return -1;
 		}
 		*size = end - *start + 1;
-		return 0;
+		goto success;
 	}
 
 	if (*str == '+') {
 		/* beginning and size given */
 		*size = strtoull_suffix(str + 1, NULL, 0);
-		return 0;
+		goto success;
 	}
 
 	return -1;
+
+success:
+	*start = _start;
+	return 0;
 }
 EXPORT_SYMBOL(parse_area_spec);
-- 
2.11.0