Btrfs-progs: fix arguments check of qgroup limit

Segmentation fault occurred in the following command.

 # btrfs qgroup limit
 Segmentation fault

So, we should check a minimum number of arguments.

Signed-off-by: Tsutomu Itoh <t-itoh@jp.fujitsu.com>

diff --git a/cmds-qgroup.c b/cmds-qgroup.c
index 15534ea..1525c11 100644 (file)
--- a/cmds-qgroup.c
+++ b/cmds-qgroup.c
@@ -374,6 +374,9 @@ static int cmd_qgroup_limit(int argc, char **argv)
                }
        }
 
+       if (check_argc_min(argc - optind, 2))
+               usage(cmd_qgroup_limit_usage);
+
        if (!parse_limit(argv[optind], &size)) {
                fprintf(stderr, "Invalid size argument given\n");
                return 1;