memory leak in reiserfs_parse

similar bugs (1):
Kernel	Title	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
upstream	memory leak in reiserfs_parse_options reiserfs	C			4	920d	1116d	17/24	fixed on 2020/11/16 12:12

BUG: memory leak
unreferenced object 0xffff88810f4f5600 (size 32):
  comm "syz-executor300", pid 5077, jiffies 4294958926 (age 8.040s)
  hex dump (first 32 bytes):
    73 79 7a 00 00 00 00 00 00 00 00 00 00 00 00 00  syz.............
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
  backtrace:
    [<ffffffff814f9c67>] __do_kmalloc_node mm/slab_common.c:967 [inline]
    [<ffffffff814f9c67>] __kmalloc_node_track_caller+0x47/0x120 mm/slab_common.c:988
    [<ffffffff814e9feb>] kstrdup+0x3b/0x70 mm/util.c:61
    [<ffffffff8177b635>] reiserfs_parse_options+0xad5/0x1090 fs/reiserfs/super.c:1279
    [<ffffffff8177f73d>] reiserfs_fill_super+0x17d/0x15d0 fs/reiserfs/super.c:1933
    [<ffffffff8160f503>] mount_bdev+0x223/0x260 fs/super.c:1359
    [<ffffffff81673a1b>] legacy_get_tree+0x2b/0x90 fs/fs_context.c:610
    [<ffffffff8160d088>] vfs_get_tree+0x28/0x100 fs/super.c:1489
    [<ffffffff81650f27>] do_new_mount fs/namespace.c:3145 [inline]
    [<ffffffff81650f27>] path_mount+0xc37/0x10d0 fs/namespace.c:3475
    [<ffffffff81651b5e>] do_mount fs/namespace.c:3488 [inline]
    [<ffffffff81651b5e>] __do_sys_mount fs/namespace.c:3697 [inline]
    [<ffffffff81651b5e>] __se_sys_mount fs/namespace.c:3674 [inline]
    [<ffffffff81651b5e>] __x64_sys_mount+0x18e/0x1d0 fs/namespace.c:3674
    [<ffffffff848ef725>] do_syscall_x64 arch/x86/entry/common.c:50 [inline]
    [<ffffffff848ef725>] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
    [<ffffffff84a00087>] entry_SYSCALL_64_after_hwframe+0x63/0xcd