BUG: memory leak
unreferenced object 0xffff88811612bc00 (size 224):
  comm "syz-executor.0", pid 9371, jiffies 4294968432 (age 11.070s)
  hex dump (first 32 bytes):
    a0 e4 a7 06 81 88 ff ff a0 e4 a7 06 81 88 ff ff  ................
    00 c0 21 03 81 88 ff ff 00 00 00 00 00 00 00 00  ..!.............
  backtrace:
    [<0000000047cdf834>] __build_skb+0x1f/0x100 net/core/skbuff.c:311
    [<00000000168d5d83>] __napi_alloc_skb+0xe5/0x140 net/core/skbuff.c:523
    [<00000000d946af13>] napi_alloc_skb include/linux/skbuff.h:2865 [inline]
    [<00000000d946af13>] napi_get_frags net/core/dev.c:6053 [inline]
    [<00000000d946af13>] napi_get_frags+0x3a/0x70 net/core/dev.c:6048
    [<00000000428b5247>] tun_napi_alloc_frags drivers/net/tun.c:1425 [inline]
    [<00000000428b5247>] tun_get_user+0xa43/0x1660 drivers/net/tun.c:1789
    [<000000006a0aab2e>] tun_chr_write_iter+0x66/0xa0 drivers/net/tun.c:1986
    [<00000000c5811b9e>] call_write_iter include/linux/fs.h:1882 [inline]
    [<00000000c5811b9e>] new_sync_write+0x173/0x210 fs/read_write.c:503
    [<0000000060d4e882>] vfs_write+0x21d/0x280 fs/read_write.c:578
    [<00000000a06c4dad>] ksys_write+0x72/0x120 fs/read_write.c:631
    [<00000000825ca8f6>] do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
    [<000000002b41a934>] entry_SYSCALL_64_after_hwframe+0x44/0xa9