// https://syzkaller.appspot.com/bug?id=6dcd14a729df98f989c7b76d254226ae67084efd
// autogenerated by syzkaller (http://github.com/google/syzkaller)

#define _GNU_SOURCE
#include <endian.h>
#include <fcntl.h>
#include <stdint.h>
#include <stdio.h>
#include <string.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/syscall.h>
#include <unistd.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[1];
void loop()
{
  memset(r, -1, sizeof(r));
  syscall(__NR_mmap, 0x20000000, 0xfff000, 3, 0x32, -1, 0);
  memcpy((void*)0x20e48000, "/dev/sg#", 9);
  r[0] = syz_open_dev(0x20e48000, 0, 0x802);
  *(uint8_t*)0x20efef0b = 0;
  *(uint8_t*)0x20efef0c = 0;
  *(uint16_t*)0x20efef0d = 0;
  *(uint16_t*)0x20efef0f = 0;
  *(uint16_t*)0x20efef11 = 0;
  *(uint16_t*)0x20efef13 = 0;
  STORE_BY_BITMASK(uint8_t, 0x20efef15, 0, 0, 4);
  STORE_BY_BITMASK(uint8_t, 0x20efef15, 6, 4, 4);
  memcpy((void*)0x20efef16, "\x73\x9e\x3f", 3);
  *(uint16_t*)0x20efef19 = htobe16(0x10);
  *(uint8_t*)0x20efef1b = 0;
  *(uint8_t*)0x20efef1c = 0;
  *(uint8_t*)0x20efef1d = 0xfe;
  *(uint8_t*)0x20efef1e = 0x80;
  *(uint8_t*)0x20efef1f = 0;
  *(uint8_t*)0x20efef20 = 0;
  *(uint8_t*)0x20efef21 = 0;
  *(uint8_t*)0x20efef22 = 0;
  *(uint8_t*)0x20efef23 = 0;
  *(uint8_t*)0x20efef24 = 0;
  *(uint8_t*)0x20efef25 = 0;
  *(uint8_t*)0x20efef26 = 0;
  *(uint8_t*)0x20efef27 = 0;
  *(uint8_t*)0x20efef28 = 0;
  *(uint8_t*)0x20efef29 = 0;
  *(uint8_t*)0x20efef2a = 0;
  *(uint8_t*)0x20efef2b = 0;
  *(uint8_t*)0x20efef2c = 0xbb;
  *(uint8_t*)0x20efef2d = -1;
  *(uint8_t*)0x20efef2e = 1;
  *(uint8_t*)0x20efef2f = 0;
  *(uint8_t*)0x20efef30 = 0;
  *(uint8_t*)0x20efef31 = 0;
  *(uint8_t*)0x20efef32 = 0;
  *(uint8_t*)0x20efef33 = 0;
  *(uint8_t*)0x20efef34 = 0;
  *(uint8_t*)0x20efef35 = 0;
  *(uint8_t*)0x20efef36 = 0;
  *(uint8_t*)0x20efef37 = 0;
  *(uint8_t*)0x20efef38 = 0;
  *(uint8_t*)0x20efef39 = 0;
  *(uint8_t*)0x20efef3a = 0;
  *(uint8_t*)0x20efef3b = 0;
  *(uint8_t*)0x20efef3c = 1;
  *(uint16_t*)0x20efef3d = 0;
  *(uint16_t*)0x20efef3f = 0;
  *(uint8_t*)0x20efef41 = 4;
  STORE_BY_BITMASK(uint8_t, 0x20efef42, 1, 0, 4);
  STORE_BY_BITMASK(uint8_t, 0x20efef42, 0, 4, 4);
  *(uint16_t*)0x20efef43 = 0;
  STORE_BY_BITMASK(uint8_t, 0x20efef45, 0, 0, 1);
  STORE_BY_BITMASK(uint8_t, 0x20efef45, 0, 1, 4);
  STORE_BY_BITMASK(uint8_t, 0x20efef45, 0, 5, 3);
  memcpy((void*)0x20efef46, "\x83\xd4\xb5", 3);
  *(uint8_t*)0x20efef49 = 0;
  memcpy((void*)0x20efef4a, "\xff\x00\xa4", 3);
  struct csum_inet csum_1;
  csum_inet_init(&csum_1);
  csum_inet_update(&csum_1, (const uint8_t*)0x20efef1d, 16);
  csum_inet_update(&csum_1, (const uint8_t*)0x20efef2d, 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*)0x20efef3d, 16);
  *(uint16_t*)0x20efef43 = csum_inet_digest(&csum_1);
  syscall(__NR_write, r[0], 0x20efef0b, 0x42);
  syscall(__NR_read, r[0], 0x201eb000, 0xb3);
}

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