syzkaller-repros/linux/83bec290888c08680fb630ec3a2bc87d0ad4b73f.c

// KASAN: use-after-free Read in remove_wait_queue (2)
// https://syzkaller.appspot.com/bug?id=83bec290888c08680fb630ec3a2bc87d0ad4b73f
// status:fixed
// autogenerated by syzkaller (http://github.com/google/syzkaller)

#define _GNU_SOURCE
#include <endian.h>
#include <stdint.h>
#include <string.h>
#include <sys/syscall.h>
#include <unistd.h>

uint64_t r[2] = {0xffffffffffffffff, 0xffffffffffffffff};
void loop()
{
  long res;
  syscall(__NR_unshare, 0x400);
  memcpy((void*)0x20b31ff7, "/dev/ppp", 9);
  res = syscall(__NR_openat, 0xffffffffffffff9c, 0x20b31ff7, 0, 0);
  if (res != -1)
    r[0] = res;
  syscall(__NR_ioctl, r[0], 0xc004743e, 0x20000100);
  res = syscall(__NR_epoll_create, 0x1ffe);
  if (res != -1)
    r[1] = res;
  *(uint32_t*)0x201b3073 = 0;
  *(uint64_t*)0x201b3077 = 0;
  syscall(__NR_epoll_ctl, r[1], 1, r[0], 0x201b3073);
  syscall(__NR_ioctl, r[0], 0x4004743c, 0x20d1df52);
}

int main()
{
  syscall(__NR_mmap, 0x20000000, 0x1000000, 3, 0x32, -1, 0);
  loop();
  return 0;
}