commit 4b59352edb5ce783ba578d708de1fda981acfec6
Author: Frank Sorenson <fsorenso@redhat.com>
Date:   Fri Jul 4 15:31:50 2014 -0400

    mke2fs: prevent creation of filesystem with unsupported revision

    It's a bit strange to accept revision levels higher than
    the code creating the filesystem can understand, so don't
    allow it.

    At least the kernel will mount the fs readonly if it's too
    high, but no other utility will touch it, so you can't
    fix the error.

    Just reject anything > EXT2_MAX_SUPP_REV at mkfs time.

    Signed-off-by: Frank Sorenson <fsorenso@redhat.com>
    [sandeen@redhat.com: Add more verbose commit log]
    Signed-off-by: Eric Sandeen <sandeen@redhat.com>
    Signed-off-by: Theodore Ts'o <tytso@mit.edu>

Index: e2fsprogs-1.42.9/misc/mke2fs.c
===================================================================
--- e2fsprogs-1.42.9.orig/misc/mke2fs.c
+++ e2fsprogs-1.42.9/misc/mke2fs.c
@@ -1570,6 +1570,11 @@ 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 */