// https://syzkaller.appspot.com/bug?id=263581c5f28c96f8c41b69579cddf33ea05af490
// autogenerated by syzkaller (https://github.com/google/syzkaller)

#define _GNU_SOURCE

#include <endian.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/syscall.h>
#include <sys/types.h>
#include <unistd.h>

#define BITMASK(bf_off, bf_len) (((1ull << (bf_len)) - 1) << (bf_off))
#define STORE_BY_BITMASK(type, htobe, addr, val, bf_off, bf_len)               \
  *(type*)(addr) =                                                             \
      htobe((htobe(*(type*)(addr)) & ~BITMASK((bf_off), (bf_len))) |           \
            (((type)(val) << (bf_off)) & BITMASK((bf_off), (bf_len))))

struct csum_inet {
  uint32_t acc;
};

static void csum_inet_init(struct csum_inet* csum)
{
  csum->acc = 0;
}

static void csum_inet_update(struct csum_inet* csum, const uint8_t* data,
                             size_t length)
{
  if (length == 0)
    return;
  size_t i = 0;
  for (; i < length - 1; i += 2)
    csum->acc += *(uint16_t*)&data[i];
  if (length & 1)
    csum->acc += le16toh((uint16_t)data[length - 1]);
  while (csum->acc > 0xffff)
    csum->acc = (csum->acc & 0xffff) + (csum->acc >> 16);
}

static uint16_t csum_inet_digest(struct csum_inet* csum)
{
  return ~csum->acc;
}

uint64_t r[2] = {0xffffffffffffffff, 0xffffffffffffffff};

int main(void)
{
  syscall(__NR_mmap, 0x1ffff000ul, 0x1000ul, 0ul, 0x32ul, -1, 0ul);
  syscall(__NR_mmap, 0x20000000ul, 0x1000000ul, 7ul, 0x32ul, -1, 0ul);
  syscall(__NR_mmap, 0x21000000ul, 0x1000ul, 0ul, 0x32ul, -1, 0ul);
  intptr_t res = 0;
  memcpy((void*)0x20000100, "/dev/net/tun\000", 13);
  res =
      syscall(__NR_openat, 0xffffffffffffff9cul, 0x20000100ul, 0x41841ul, 0ul);
  if (res != -1)
    r[0] = res;
  memcpy((void*)0x200000c0, "syzkaller1\000\000\000\000\000\000", 16);
  *(uint16_t*)0x200000d0 = 0x8c32;
  syscall(__NR_ioctl, r[0], 0x400454ca, 0x200000c0ul);
  res = syscall(__NR_socket, 2ul, 0xaul, 2);
  if (res != -1)
    r[1] = res;
  memcpy((void*)0x20000180, "syzkaller1\000\000\000\000\000\000", 16);
  *(uint8_t*)0x20000190 = 1;
  *(uint8_t*)0x20000191 = 0x80;
  *(uint8_t*)0x20000192 = 0xc2;
  *(uint8_t*)0x20000193 = 0;
  *(uint8_t*)0x20000194 = 0;
  *(uint8_t*)0x20000195 = 0;
  syscall(__NR_ioctl, r[1], 0x8914, 0x20000180ul);
  *(uint16_t*)0x200001c0 = 0;
  *(uint16_t*)0x200001c2 = htobe16(0);
  memset((void*)0x200001c4, 170, 5);
  *(uint8_t*)0x200001c9 = 0xbb;
  memcpy((void*)0x200001ca, "\x22\x7b\xc8\x23\xec\x84", 6);
  *(uint16_t*)0x200001d0 = htobe16(0x8848);
  STORE_BY_BITMASK(uint8_t, , 0x200001d2, 5, 0, 4);
  STORE_BY_BITMASK(uint8_t, , 0x200001d2, 4, 4, 4);
  STORE_BY_BITMASK(uint8_t, , 0x200001d3, 0, 0, 2);
  STORE_BY_BITMASK(uint8_t, , 0x200001d3, 0, 2, 6);
  *(uint16_t*)0x200001d4 = htobe16(0x1c);
  *(uint16_t*)0x200001d6 = htobe16(0);
  *(uint16_t*)0x200001d8 = htobe16(0);
  *(uint8_t*)0x200001da = 0;
  *(uint8_t*)0x200001db = 0x11;
  *(uint16_t*)0x200001dc = htobe16(0);
  *(uint8_t*)0x200001de = 0xac;
  *(uint8_t*)0x200001df = 0x14;
  *(uint8_t*)0x200001e0 = 0x14;
  *(uint8_t*)0x200001e1 = 0xbb;
  *(uint8_t*)0x200001e2 = 0xac;
  *(uint8_t*)0x200001e3 = 0x14;
  *(uint8_t*)0x200001e4 = 0x14;
  *(uint8_t*)0x200001e5 = 0xaa;
  *(uint8_t*)0x200001e6 = 0x12;
  *(uint8_t*)0x200001e7 = 0;
  *(uint16_t*)0x200001e8 = htobe16(0);
  *(uint32_t*)0x200001ea = htobe32(0);
  struct csum_inet csum_1;
  csum_inet_init(&csum_1);
  csum_inet_update(&csum_1, (const uint8_t*)0x200001e6, 8);
  *(uint16_t*)0x200001e8 = csum_inet_digest(&csum_1);
  struct csum_inet csum_2;
  csum_inet_init(&csum_2);
  csum_inet_update(&csum_2, (const uint8_t*)0x200001d2, 20);
  *(uint16_t*)0x200001dc = csum_inet_digest(&csum_2);
  syscall(__NR_write, r[0], 0x200001c0ul, 0x2eul);
  return 0;
}