syzbot

executing program
BUG: memory leak
unreferenced object 0xffff888118d545a0 (size 32):
  comm "syz-executor875", pid 6496, jiffies 4294942702 (age 12.830s)
  hex dump (first 32 bytes):
    73 79 7a 00 00 00 00 00 c0 f4 2e 19 81 88 ff ff  syz.............
    01 00 00 00 03 00 00 00 11 00 00 00 00 00 00 00  ................
  backtrace:
    [<00000000b09c3c6c>] kstrdup+0x36/0x70 mm/util.c:60
    [<00000000700877c1>] reiserfs_parse_options+0x8b0/0xdd0 fs/reiserfs/super.c:1277
    [<0000000085aac41b>] reiserfs_fill_super+0x180/0x10ac fs/reiserfs/super.c:1941
    [<00000000e2f81fd9>] mount_bdev+0x1d3/0x210 fs/super.c:1417
    [<00000000cfb8f4fa>] legacy_get_tree+0x26/0x70 fs/fs_context.c:592
    [<00000000cdc6c89c>] vfs_get_tree+0x28/0xe0 fs/super.c:1547
    [<0000000084ca15da>] do_new_mount fs/namespace.c:2875 [inline]
    [<0000000084ca15da>] path_mount+0x90e/0xda0 fs/namespace.c:3192
    [<00000000a0716d08>] do_mount fs/namespace.c:3205 [inline]
    [<00000000a0716d08>] __do_sys_mount fs/namespace.c:3413 [inline]
    [<00000000a0716d08>] __se_sys_mount fs/namespace.c:3390 [inline]
    [<00000000a0716d08>] __x64_sys_mount+0x140/0x190 fs/namespace.c:3390
    [<0000000082d042cf>] do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
    [<0000000053f8569b>] entry_SYSCALL_64_after_hwframe+0x44/0xa9