syzkaller-repros/linux/01b492b33678ff55be2662197c845a8db5e6b148.c

// general protection fault in refcount_sub_and_test
// https://syzkaller.appspot.com/bug?id=01b492b33678ff55be2662197c845a8db5e6b148
// status:open
// autogenerated by syzkaller (https://github.com/google/syzkaller)

#define _GNU_SOURCE

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

static long syz_open_dev(volatile long a0, volatile long a1, volatile long 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) - 1);
    buf[sizeof(buf) - 1] = 0;
    while ((hash = strchr(buf, '#'))) {
      *hash = '0' + (char)(a1 % 10);
      a1 /= 10;
    }
    return open(buf, a2, 0);
  }
}

uint64_t r[1] = {0xffffffffffffffff};

int main(void)
{
  syscall(__NR_mmap, 0x20000000, 0x1000000, 3, 0x32, -1, 0);
  long res = 0;
  memcpy((void*)0x20000240, "/dev/swradio#\000", 14);
  res = syz_open_dev(0x20000240, 0, 2);
  if (res != -1)
    r[0] = res;
  *(uint32_t*)0x20000080 = 0;
  *(uint32_t*)0x20000084 = 9;
  *(uint32_t*)0x20000088 = 1;
  *(uint32_t*)0x20000090 = 0xb;
  *(uint32_t*)0x20000098 = 0;
  *(uint32_t*)0x2000009c = 0xffff;
  *(uint32_t*)0x200000a0 = 0;
  *(uint32_t*)0x200000a4 = 0;
  *(uint32_t*)0x200000a8 = 0;
  *(uint32_t*)0x200000ac = 0;
  *(uint64_t*)0x200000b0 = 0;
  *(uint32_t*)0x200000b8 = 0;
  *(uint64_t*)0x200000c0 = 0;
  *(uint8_t*)0x200000c8 = 0;
  *(uint32_t*)0x20000160 = 0;
  *(uint32_t*)0x20000164 = 0;
  *(uint32_t*)0x20000168 = 0;
  *(uint32_t*)0x2000016c = 0;
  *(uint32_t*)0x20000170 = 0;
  *(uint32_t*)0x20000174 = 0;
  *(uint32_t*)0x20000178 = 0;
  *(uint32_t*)0x2000017c = 0;
  syscall(__NR_ioctl, r[0], 0xc100565c, 0x20000080);
  *(uint32_t*)0x20001280 = 0;
  *(uint32_t*)0x20001284 = 0x1ff;
  *(uint32_t*)0x20001288 = 2;
  *(uint32_t*)0x20001290 = 0xb;
  *(uint32_t*)0x20001298 = 0;
  *(uint32_t*)0x2000129c = 9;
  *(uint32_t*)0x200012a0 = 0;
  *(uint32_t*)0x200012a4 = 0;
  *(uint32_t*)0x200012a8 = 0;
  *(uint32_t*)0x200012ac = 0;
  *(uint64_t*)0x200012b0 = 0;
  *(uint32_t*)0x200012b8 = 0;
  *(uint64_t*)0x200012c0 = 0;
  *(uint8_t*)0x200012c8 = 0;
  *(uint32_t*)0x20001360 = 0;
  *(uint32_t*)0x20001364 = 0;
  *(uint32_t*)0x20001368 = 0;
  *(uint32_t*)0x2000136c = 0;
  *(uint32_t*)0x20001370 = 0;
  *(uint32_t*)0x20001374 = 0;
  *(uint32_t*)0x20001378 = 0;
  *(uint32_t*)0x2000137c = 0;
  syscall(__NR_ioctl, r[0], 0xc100565c, 0x20001280);
  return 0;
}