Experimental Physics and
Industrial Control System

[email protected] (Jeff Hill) · Thu, 13 Jan 2000 17:03:14 -0700

Noburo,

>
> Eventually we found a cause of phenomena. One of reasons of this trouble
> is a record with NULL string as its name. All three of IOCs were loaded
> a NULL named EPICS record. These records did not cause any problem,
> until I run a CA client program which search for a NULL named record!
>
> dbLoadRecords commands in EPICS R3.13.1 accepts a NULL named record
> without a error message.
> CA library on WS also accepts NULL string as a record name.

There appears to be code in the CA client library which
checks the length of the channel name string. This code is from
R3.13.2 and it is possible that R3.13.1 is different.

	/* Put some reasonable limit on user supplied string size */
	strcnt = strlen(name_str) + 1;
	if (strcnt > MAX_UDP-sizeof(caHdr))
		return ECA_STRTOBIG;
	if (strcnt == 1)
		return ECA_EMPTYSTR;

There is not at this time any code in the client library that verifies
that the channel name string pointer isn't NULL, but I have added this check
to EPICS R3.14.

Jeff

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System