callocMustSucceed suspends thread if 0 bytes are requested

[Dirk Zimoch]

The release notes say:
"mallocMustSucceed and callocMustSucceed accept 0-byte requests. Note that these routines may return a NULL pointer in such cases."
But the code does this:
    if (count == 0 || size == 0)
        cantProceed("%s: callocMustSucceed(%lu, %lu) - bad args\n",
                msg, (unsigned long)count, (unsigned long)size);

This crashes applications that assumes it is safe to allocate 0 bytes. I noticed that when I tried to start an "empty" IOC (no records defined).

Fix is simple:
if (count == 0 || size == 0) return NULL;

Original Mantis Bug: mantis-290
    http://www.aps.anl.gov/epics/mantis/view_bug_page.php?f_id=290

[Dirk Zimoch (dirk.zimoch)]

I forgot to say that the bug is new in 3.14.9.

[Andrew Johnson (anj)]

Fixed in R3.14.10.

[Andrew Johnson (anj)]

R3.14.10 released.