mail -ack crashes when there are no messages to acknowledge

[Trn]

Example:

mail -ack

Error: Attempt by mail$|5217
(>system_library_standard>bound_msg_facility_)
to reference through null pointer

[Eric Swenson]

Also happens if you use "mail -bf" and no path argument.

Issue is that there is no check for an error code return at line 545:

GET_PATH: call cu_$arg_ptr (argno, ap, al, code);

argno = argno+1;
if substr (arg, 1, 1) = "-" then go to GET_PATH;
buffer = arg;

The reference to the string at arg will reference through a null ap pointer if there is no argument at that position.

[Eric Swenson]

​https://s3.amazonaws.com/eswenson-multics/public/mcrs/MCR10070.pdf

[Eric Swenson]

Milestone renamed