BUG: memory leak
unreferenced object 0xffff88811966ed80 (size 32):
  comm "syz-executor813", pid 6447, jiffies 4294942156 (age 12.710s)
  hex dump (first 32 bytes):
    6c 6f 6f 70 30 00 00 00 40 fc 27 19 81 88 ff ff  loop0...@.'.....
    01 00 00 00 03 00 00 00 11 00 00 00 00 00 00 00  ................
  backtrace:
    [<00000000c77557c6>] kstrdup+0x36/0x70 mm/util.c:60
    [<0000000043ab2fdd>] kstrdup_const+0x35/0x60 mm/util.c:82
    [<0000000078ced327>] kvasprintf_const+0x72/0xe0 lib/kasprintf.c:48
    [<000000005381a486>] kobject_set_name_vargs+0x3b/0xe0 lib/kobject.c:289
    [<00000000458b5b57>] kobject_add_varg lib/kobject.c:384 [inline]
    [<00000000458b5b57>] kobject_init_and_add+0x6d/0xc0 lib/kobject.c:473
    [<00000000f13d2879>] ext4_register_sysfs+0x6b/0x160 fs/ext4/sysfs.c:508
    [<00000000efa17a69>] ext4_fill_super+0x2d04/0x46c0 fs/ext4/super.c:4799
    [<00000000b7a8a367>] mount_bdev+0x1d3/0x210 fs/super.c:1417
    [<00000000e6f77e33>] legacy_get_tree+0x26/0x70 fs/fs_context.c:592
    [<00000000e18ecab0>] vfs_get_tree+0x28/0xe0 fs/super.c:1547
    [<0000000070551fad>] do_new_mount fs/namespace.c:2875 [inline]
    [<0000000070551fad>] path_mount+0x90e/0xda0 fs/namespace.c:3192
    [<00000000c3f4e392>] do_mount fs/namespace.c:3205 [inline]
    [<00000000c3f4e392>] __do_sys_mount fs/namespace.c:3413 [inline]
    [<00000000c3f4e392>] __se_sys_mount fs/namespace.c:3390 [inline]
    [<00000000c3f4e392>] __x64_sys_mount+0x140/0x190 fs/namespace.c:3390
    [<000000006cbd1145>] do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
    [<00000000629d7870>] entry_SYSCALL_64_after_hwframe+0x44/0xa9