tunefs: clear the entire previous label when setting a new one

strlcpy(3) null terminates but does not zero-fill the buffer, so would
leave beind any portion of the previous volume label longer than the
new one.

Note that tunefs only allows -L args up to a length of MAXVOLLEN-1, so
the stored label will be null-terminated (whether or not required by
UFS).

Reviewed by:	imp
Sponsored by:	The FreeBSD Foundation

1 files changed, 1 insertions, 1 deletions

diff --git a/sbin/tunefs/tunefs.c b/sbin/tunefs/tunefs.c
index 15c6cf0..b03cdde7 100644
--- a/sbin/tunefs/tunefs.c
+++ b/sbin/tunefs/tunefs.c
@@ -316,7 +316,7 @@ main(int argc, char *argv[])
 	}
 	if (Lflag) {
 		name = "volume label";
-		strlcpy(sblock.fs_volname, Lvalue, MAXVOLLEN);
+		strncpy(sblock.fs_volname, Lvalue, MAXVOLLEN);
 	}
 	if (aflag) {
 		name = "POSIX.1e ACLs";