avoid several strncpy-induced buffer overruns

* restore.c (main): Ensure strncpy-copied dir_name is NUL-terminated.
* btrfsctl.c (main): Likewise, for a command-line argument.
* utils.c (multiple functions): Likewise.
* btrfs-list.c (add_root): Likewise.
* btrfslabel.c (change_label_unmounted): Likewise.
* cmds-device.c (cmd_add_dev, cmd_rm_dev, cmd_scan_dev): Likewise.
* cmds-filesystem.c (cmd_resize): Likewise.
* cmds-subvolume.c (cmd_subvol_create, cmd_subvol_delete, cmd_snapshot):
Likewise.

Reviewed-by: Josef Bacik <josef@redhat.com>

1 files changed, 3 insertions, 2 deletions

diff --git a/btrfsctl.c b/btrfsctl.c
index d45e2a76..518684c6 100644
--- a/btrfsctl.c
+++ b/btrfsctl.c
@@ -241,9 +241,10 @@ int main(int ac, char **av)
 		fd = open_file_or_dir(fname);
 	 }
 
-	if (name)
+	if (name) {
                 strncpy(args.name, name, BTRFS_PATH_NAME_MAX + 1);
-	else
+                args.name[BTRFS_PATH_NAME_MAX] = 0;
+	} else
 		args.name[0] = '\0';
 
 	if (command == BTRFS_IOC_SNAP_CREATE) {