[PATCH V2] mke2fs: prevent creation of filesystem with unsupported revision

[Eric Sandeen <sandeen@redhat.com>]

From: Frank Sorenson <fsorenso@redhat.com>

Don't create a filesystem with an unsupported revision number

Signed-off-by: Frank Sorenson <fsorenso@redhat.com>
Signed-off-by: Eric Sandeen <sandeen@redhat.com>
---

V2: Frank did this independently, and it's better.  I forgot about
using com_err here.

--- a/misc/mke2fs.c	
+++ a/misc/mke2fs.c	
@@ -1684,6 +1684,11 @@ profile_error:
 					_("bad revision level - %s"), optarg);
 				exit(1);
 			}
+			if (r_opt > EXT2_MAX_SUPP_REV) {
+				com_err(program_name, EXT2_ET_REV_TOO_HIGH,
+					_("while trying to create revision %d"), r_opt);
+				exit(1);
+			}
 			fs_param.s_rev_level = r_opt;
 			break;
 		case 's':	/* deprecated */