[BUG][PATCH][BTRFS-PROGS] Bug overflow fix

[Rock Lee <zimilo@code-trick.com>]

If there's is a long name directory exists in the /dev, then an
overflow will hit in function utils.c btrfs_scan_one_dir:1013!

The minimal fix is to use snprintf instead of strcpy.

The reason why not using strncpy is that, if there is no null byte
among the first n bytes of src, the string  placed  in  dest
will not be null - terminated.

Signed-off-by: Rock Lee <zimilo@code-trick.com>
---
 utils.c |    5 +++--
 1 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/utils.c b/utils.c
index 3c88d2e..7200aef 100644
--- a/utils.c
+++ b/utils.c
@@ -969,7 +969,7 @@ int btrfs_scan_one_dir(char *dirname, int run_ioctl)
 	pending = malloc(sizeof(*pending));
 	if (!pending)
 		return -ENOMEM;
-	strcpy(pending->name, dirname);
+	snprintf(pending->name, sizeof(pending->name), "%s", dirname);

 again:
 	dirname_len = strlen(pending->name);
@@ -1010,7 +1010,8 @@ again:
 				ret = -ENOMEM;
 				goto fail;
 			}
-			strcpy(next->name, fullpath);
+			snprintf(next->name, sizeof(next->name),
+				 "%s", fullpath);
 			list_add_tail(&next->list, &pending_list);
 		}
 		if (!S_ISBLK(st.st_mode)) {
-- 
1.7.7.6