handling the case of incorrect debug level.
also, an early check for valid compression algorithm.

Signed-off-by: Pratik Shinde <[email protected]>
---
 mkfs/main.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/mkfs/main.c b/mkfs/main.c
index fdb65fd..4231d13 100644
--- a/mkfs/main.c
+++ b/mkfs/main.c
@@ -105,10 +105,22 @@ static int mkfs_parse_options_cfg(int argc, char *argv[])
                                }
                        }
                        cfg.c_compr_alg_master = strndup(optarg, i);
+                       if (strcmp(cfg.c_compr_alg_master, "lz4")
+                           && strcmp(cfg.c_compr_alg_master, "lz4hc")) {
+                               erofs_err("invalid compressor algorithm %s",
+                                         cfg.c_compr_alg_master);
+                               return -EINVAL;
+                       }
                        break;
 
                case 'd':
                        cfg.c_dbg_lvl = parse_num_from_str(optarg);
+                       if (cfg.c_dbg_lvl < 0 || cfg.c_dbg_lvl > 9) {
+                               fprintf(stderr,
+                                       "invalid debug level %d\n",
+                                       cfg.c_dbg_lvl);
+                               return -EINVAL;
+                       }
                        break;
 
                case 'E':
-- 
2.9.3

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