[Bug librt/23855] New: Use of uninitialized variable

[wurongxin at cse dot ust.hk]

https://sourceware.org/bugzilla/show_bug.cgi?id=23855

            Bug ID: 23855
           Summary: Use of uninitialized variable
           Product: glibc
           Version: 2.28
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: librt
          Assignee: unassigned at sourceware dot org
          Reporter: wurongxin at cse dot ust.hk
  Target Milestone: ---

In the source file sysdeps/pthread/aio_misc.c, the variable policy was likely
to be assigned to aiocbp->aiocb.__policy without initialization. 


297: struct requestlist *
298: __aio_enqueue_request (aiocb_union *aiocbp, int operation) {
      ...
301:  int policy, prio;
      ...
322:  pthread_getschedparam (pthread_self (), &policy, &param);
      ...
351:  aiocbp->aiocb.__policy = policy;

      ...
}


In Line 322, the policy may be uninitialized in some paths. Please check the
function pthread_getschedparam in npt/pthread_getschedparam.c. 

int
__pthread_getschedparam (pthread_t threadid, int *policy,
                         struct sched_param *param)
{
  struct pthread *pd = (struct pthread *) threadid;

  /* Make sure the descriptor is valid.  */
  if (INVALID_TD_P (pd))
    /* Not a valid thread handle.  */
    return ESRCH;

  int result = 0;

  /* See CREATE THREAD NOTES in nptl/pthread_create.c.  */
  lll_lock (pd->lock, LLL_PRIVATE);

  /* The library is responsible for maintaining the values at all
     times.  If the user uses an interface other than
     pthread_setschedparam to modify the scheduler setting it is not
     the library's problem.  In case the descriptor's values have
     not yet been retrieved do it now.  */
  if ((pd->flags & ATTR_FLAG_SCHED_SET) == 0)
    {
      if (__sched_getparam (pd->tid, &pd->schedparam) != 0)
        result = 1;
      else
        pd->flags |= ATTR_FLAG_SCHED_SET;
    }

  if ((pd->flags & ATTR_FLAG_POLICY_SET) == 0)
    {
      pd->schedpolicy = __sched_getscheduler (pd->tid);
      if (pd->schedpolicy == -1)
        result = 1;
      else
        pd->flags |= ATTR_FLAG_POLICY_SET;
    }

  if (result == 0)
    {
      *policy = pd->schedpolicy;
      memcpy (param, &pd->schedparam, sizeof (struct sched_param));
    }

  lll_unlock (pd->lock, LLL_PRIVATE);

  return result;
}
strong_alias (__pthread_getschedparam, pthread_getschedparam)

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