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From: "adhemerval.zanella at linaro dot org"
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Subject: [Bug libc/29304] New: mq_timedreceive does not handle 64 bit syscall
 return correct for !__ASSUME_TIME64_SYSCALLS
Date: Thu, 30 Jun 2022 11:18:56 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D29304

            Bug ID: 29304
           Summary: mq_timedreceive does not handle 64 bit syscall return
                    correct for !__ASSUME_TIME64_SYSCALLS
           Product: glibc
           Version: 2.32
            Status: NEW
          Severity: normal
          Priority: P2
         Component: libc
          Assignee: unassigned at sourceware dot org
          Reporter: adhemerval.zanella at linaro dot org
                CC: drepper.fsp at gmail dot com
  Target Milestone: ---

On the code path for builds without 64 bit time_t default syscall, the chec=
k to
fallback to 32 bit is wrong:

 38   bool need_time64 =3D abs_timeout !=3D NULL
 39                      && !in_time_t_range (abs_timeout->tv_sec);
 40   if (need_time64)
 41     {
 42       int r =3D SYSCALL_CANCEL (mq_timedreceive_time64, mqdes, msg_ptr,
msg_len,
 43                               msg_prio, abs_timeout);
 44       if (r =3D=3D 0 || errno !=3D ENOSYS)
 45         return r;
 46       __set_errno (EOVERFLOW);
 47       return -1;
 48     }

It should check if 'r >=3D 0'.

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