btrfs-progs: fix mkfs.btrfs segfault with --features option

The mkfs.btrfs --features long option takes an argument but does not
declare it. Consequently getopt does not allocate an argument, which
makes an unconditional strdup() crash during options parsing.
Fix by declaring the argument in the options alias array.

Signed-off-by: Holger Hoffstätte <holger.hoffstaette@googlemail.com>
Signed-off-by: David Sterba <dsterba@suse.cz>

1 files changed, 1 insertions, 1 deletions

diff --git a/mkfs.c b/mkfs.c
index 4f5ee07e..16e92221 100644
--- a/mkfs.c
+++ b/mkfs.c
@@ -350,7 +350,7 @@ static struct option long_options[] = {
 	{ "version", 0, NULL, 'V' },
 	{ "rootdir", 1, NULL, 'r' },
 	{ "nodiscard", 0, NULL, 'K' },
-	{ "features", 0, NULL, 'O' },
+	{ "features", 1, NULL, 'O' },
 	{ NULL, 0, NULL, 0}
 };