// https://syzkaller.appspot.com/bug?id=a5c74eee04149854dd8b59fdfc0529a60be422a7
// autogenerated by syzkaller (http://github.com/google/syzkaller)

#define _GNU_SOURCE

#include <fcntl.h>
#include <stdio.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/syscall.h>
#include <unistd.h>

#include <stdint.h>
#include <string.h>

#define BITMASK_LEN(type, bf_len) (type)((1ull << (bf_len)) - 1)

#define BITMASK_LEN_OFF(type, bf_off, bf_len)                          \
  (type)(BITMASK_LEN(type, (bf_len)) << (bf_off))

#define STORE_BY_BITMASK(type, addr, val, bf_off, bf_len)              \
  if ((bf_off) == 0 && (bf_len) == 0) {                                \
    *(type*)(addr) = (type)(val);                                      \
  } else {                                                             \
    type new_val = *(type*)(addr);                                     \
    new_val &= ~BITMASK_LEN_OFF(type, (bf_off), (bf_len));             \
    new_val |= ((type)(val)&BITMASK_LEN(type, (bf_len))) << (bf_off);  \
    *(type*)(addr) = new_val;                                          \
  }

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;
  for (i = 0; i < length - 1; i += 2)
    csum->acc += *(uint16_t*)&data[i];

  if (length & 1)
    csum->acc += (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;
}

static uintptr_t syz_open_dev(uintptr_t a0, uintptr_t a1, uintptr_t a2)
{
  if (a0 == 0xc || a0 == 0xb) {
    char buf[128];
    sprintf(buf, "/dev/%s/%d:%d", a0 == 0xc ? "char" : "block",
            (uint8_t)a1, (uint8_t)a2);
    return open(buf, O_RDWR, 0);
  } else {
    char buf[1024];
    char* hash;
    strncpy(buf, (char*)a0, sizeof(buf));
    buf[sizeof(buf) - 1] = 0;
    while ((hash = strchr(buf, '#'))) {
      *hash = '0' + (char)(a1 % 10);
      a1 /= 10;
    }
    return open(buf, a2, 0);
  }
}

long r[5];
void loop()
{
  memset(r, -1, sizeof(r));
  syscall(__NR_mmap, 0x20000000ul, 0xfff000ul, 0x3ul, 0x32ul,
          0xfffffffffffffffful, 0x0ul);
  r[0] = syscall(__NR_socket, 0x2ul, 0x1ul, 0x0ul);
  memcpy((void*)0x20c55000, "/dev/net/tun", 13);
  r[1] = syz_open_dev(0x20c55000ul, 0x0ul, 0x0ul);
  r[2] = syscall(__NR_fcntl, r[1], 0x0ul, r[1]);
  r[3] = syscall(__NR_socket, 0x2000000011ul, 0x8000000080003ul, 0x6ul);
  *(uint8_t*)0x20927fd8 = (uint8_t)0x73;
  *(uint8_t*)0x20927fd9 = (uint8_t)0x79;
  *(uint8_t*)0x20927fda = (uint8_t)0x7a;
  *(uint8_t*)0x20927fdb = (uint8_t)0x30;
  *(uint8_t*)0x20927fdc = (uint8_t)0x0;
  *(uint32_t*)0x20927fe8 = (uint32_t)0x5;
  *(uint32_t*)0x20927fec = (uint32_t)0x0;
  *(uint64_t*)0x20927ff0 = (uint64_t)0x201a3ff4;
  *(uint32_t*)0x201a3ff4 = (uint32_t)0x0;
  *(uint32_t*)0x201a3ff8 = (uint32_t)0x0;
  *(uint16_t*)0x201a3ffc = (uint16_t)0x0;
  syscall(__NR_ioctl, r[1], 0x400454caul, 0x20927fd8ul);
  *(uint8_t*)0x2062ffe0 = (uint8_t)0x73;
  *(uint8_t*)0x2062ffe1 = (uint8_t)0x79;
  *(uint8_t*)0x2062ffe2 = (uint8_t)0x7a;
  *(uint8_t*)0x2062ffe3 = (uint8_t)0x30;
  *(uint8_t*)0x2062ffe4 = (uint8_t)0x0;
  *(uint16_t*)0x2062fff0 = (uint16_t)0x20301;
  syscall(__NR_ioctl, r[0], 0x8914ul, 0x2062ffe0ul);
  *(uint32_t*)0x20113000 = (uint32_t)0x1000;
  syscall(__NR_setsockopt, r[3], 0x107ul, 0xful, 0x20113000ul, 0x4ul);
  *(uint8_t*)0x20b13000 = (uint8_t)0x73;
  *(uint8_t*)0x20b13001 = (uint8_t)0x79;
  *(uint8_t*)0x20b13002 = (uint8_t)0x7a;
  *(uint8_t*)0x20b13003 = (uint8_t)0x30;
  *(uint8_t*)0x20b13004 = (uint8_t)0x0;
  *(uint32_t*)0x20b13010 = (uint32_t)0x0;
  *(uint8_t*)0x20b13014 = (uint8_t)0x0;
  *(uint8_t*)0x20b13015 = (uint8_t)0x0;
  *(uint8_t*)0x20b13016 = (uint8_t)0x0;
  *(uint8_t*)0x20b13017 = (uint8_t)0x0;
  *(uint8_t*)0x20b13018 = (uint8_t)0x0;
  *(uint8_t*)0x20b13019 = (uint8_t)0x0;
  *(uint8_t*)0x20b1301a = (uint8_t)0x0;
  *(uint8_t*)0x20b1301b = (uint8_t)0x0;
  *(uint8_t*)0x20b1301c = (uint8_t)0x0;
  *(uint8_t*)0x20b1301d = (uint8_t)0x0;
  *(uint8_t*)0x20b1301e = (uint8_t)0x0;
  *(uint8_t*)0x20b1301f = (uint8_t)0x0;
  *(uint8_t*)0x20b13020 = (uint8_t)0x0;
  *(uint8_t*)0x20b13021 = (uint8_t)0x0;
  *(uint8_t*)0x20b13022 = (uint8_t)0x0;
  *(uint8_t*)0x20b13023 = (uint8_t)0x0;
  *(uint8_t*)0x20b13024 = (uint8_t)0x0;
  *(uint8_t*)0x20b13025 = (uint8_t)0x0;
  *(uint8_t*)0x20b13026 = (uint8_t)0x0;
  *(uint8_t*)0x20b13027 = (uint8_t)0x0;
  if (syscall(__NR_ioctl, r[3], 0x8933ul, 0x20b13000ul) != -1) {
    r[4] = *(uint32_t*)0x20b13010;
  }
  *(uint16_t*)0x20c85000 = (uint16_t)0x11;
  *(uint16_t*)0x20c85002 = (uint16_t)0x0;
  *(uint32_t*)0x20c85004 = r[4];
  *(uint16_t*)0x20c85008 = (uint16_t)0x1;
  *(uint8_t*)0x20c8500a = (uint8_t)0x0;
  *(uint8_t*)0x20c8500b = (uint8_t)0x6;
  *(uint8_t*)0x20c8500c = (uint8_t)0xaa;
  *(uint8_t*)0x20c8500d = (uint8_t)0xaa;
  *(uint8_t*)0x20c8500e = (uint8_t)0xaa;
  *(uint8_t*)0x20c8500f = (uint8_t)0xaa;
  *(uint8_t*)0x20c85010 = (uint8_t)0xaa;
  *(uint8_t*)0x20c85011 = (uint8_t)0x0;
  *(uint8_t*)0x20c85012 = (uint8_t)0x0;
  *(uint8_t*)0x20c85013 = (uint8_t)0x0;
  syscall(__NR_bind, r[3], 0x20c85000ul, 0x14ul);
  syscall(__NR_dup2, r[3], r[2]);
  *(uint8_t*)0x204f0000 = (uint8_t)0x0;
  *(uint8_t*)0x204f0001 = (uint8_t)0x4;
  *(uint16_t*)0x204f0002 = (uint16_t)0x0;
  *(uint16_t*)0x204f0004 = (uint16_t)0x3;
  *(uint16_t*)0x204f0006 = (uint16_t)0x0;
  *(uint16_t*)0x204f0008 = (uint16_t)0x0;
  STORE_BY_BITMASK(uint8_t, 0x204f000a, 0x0, 0, 4);
  STORE_BY_BITMASK(uint8_t, 0x204f000a, 0x6, 4, 4);
  memcpy((void*)0x204f000b, "\x35\x6d\x06", 3);
  *(uint16_t*)0x204f000e = (uint16_t)0x1000;
  *(uint8_t*)0x204f0010 = (uint8_t)0x0;
  *(uint8_t*)0x204f0011 = (uint8_t)0x0;
  *(uint64_t*)0x204f0012 = (uint64_t)0x0;
  *(uint64_t*)0x204f001a = (uint64_t)0x100000000000000;
  *(uint8_t*)0x204f0022 = (uint8_t)0xfe;
  *(uint8_t*)0x204f0023 = (uint8_t)0x80;
  *(uint8_t*)0x204f0024 = (uint8_t)0x0;
  *(uint8_t*)0x204f0025 = (uint8_t)0x0;
  *(uint8_t*)0x204f0026 = (uint8_t)0x0;
  *(uint8_t*)0x204f0027 = (uint8_t)0x0;
  *(uint8_t*)0x204f0028 = (uint8_t)0x0;
  *(uint8_t*)0x204f0029 = (uint8_t)0x0;
  *(uint8_t*)0x204f002a = (uint8_t)0x0;
  *(uint8_t*)0x204f002b = (uint8_t)0x0;
  *(uint8_t*)0x204f002c = (uint8_t)0x0;
  *(uint8_t*)0x204f002d = (uint8_t)0x0;
  *(uint8_t*)0x204f002e = (uint8_t)0x0;
  *(uint8_t*)0x204f002f = (uint8_t)0x0;
  *(uint8_t*)0x204f0030 = (uint8_t)0x0;
  *(uint8_t*)0x204f0031 = (uint8_t)0xaa;
  *(uint16_t*)0x204f0032 = (uint16_t)0x204e;
  *(uint16_t*)0x204f0034 = (uint16_t)0x204e;
  *(uint8_t*)0x204f0036 = (uint8_t)0x4;
  STORE_BY_BITMASK(uint8_t, 0x204f0037, 0x1, 0, 4);
  STORE_BY_BITMASK(uint8_t, 0x204f0037, 0x0, 4, 4);
  *(uint16_t*)0x204f0038 = (uint16_t)0x0;
  STORE_BY_BITMASK(uint8_t, 0x204f003a, 0x0, 0, 1);
  STORE_BY_BITMASK(uint8_t, 0x204f003a, 0x0, 1, 4);
  STORE_BY_BITMASK(uint8_t, 0x204f003a, 0x0, 5, 3);
  memcpy((void*)0x204f003b, "\x80\x00\x5e", 3);
  *(uint8_t*)0x204f003e = (uint8_t)0x0;
  memcpy((void*)0x204f003f, "\xaa\x90\xf7", 3);
  struct csum_inet csum_1;
  csum_inet_init(&csum_1);
  csum_inet_update(&csum_1, (const uint8_t*)0x204f0012, 16);
  csum_inet_update(&csum_1, (const uint8_t*)0x204f0022, 16);
  uint32_t csum_1_chunk_2 = 0x10000000;
  csum_inet_update(&csum_1, (const uint8_t*)&csum_1_chunk_2, 4);
  uint32_t csum_1_chunk_3 = 0x21000000;
  csum_inet_update(&csum_1, (const uint8_t*)&csum_1_chunk_3, 4);
  csum_inet_update(&csum_1, (const uint8_t*)0x204f0032, 16);
  *(uint16_t*)0x204f0038 = csum_inet_digest(&csum_1);
  syscall(__NR_write, r[2], 0x204f0000ul, 0x42ul);
}

int main()
{
  loop();
  return 0;
}