diff options
Diffstat (limited to 'btrfs-select-super.c')
| -rw-r--r-- | btrfs-select-super.c | 12 |
1 files changed, 9 insertions, 3 deletions
diff --git a/btrfs-select-super.c b/btrfs-select-super.c index 6a458b8..15e6921 100644 --- a/btrfs-select-super.c +++ b/btrfs-select-super.c @@ -43,7 +43,7 @@ int main(int ac, char **av) { struct btrfs_root *root; int ret; - int num = 0; + u64 num = 0; u64 bytenr = 0; while(1) { @@ -53,8 +53,14 @@ int main(int ac, char **av) break; switch(c) { case 's': - num = atol(optarg); - bytenr = btrfs_sb_offset(num); + num = arg_strtou64(optarg); + if (num >= BTRFS_SUPER_MIRROR_MAX) { + fprintf(stderr, + "ERROR: super mirror should be less than: %d\n", + BTRFS_SUPER_MIRROR_MAX); + exit(1); + } + bytenr = btrfs_sb_offset(((int)num)); break; default: print_usage(); |