[Bug translator/22392] New: bpf translator: segfault possible when performing operation on result of void function call.

[amerey at redhat dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=22392

            Bug ID: 22392
           Summary: bpf translator: segfault possible when performing
                    operation on result of void function call.
           Product: systemtap
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: translator
          Assignee: systemtap at sourceware dot org
          Reporter: amerey at redhat dot com
  Target Milestone: ---

example:

stap --runtime=bpf -u -e 'probe kernel.function("sys_read") { x =
printf("test\n") }'

When translating the assignment, the bpf translator attempts to dereference a
NULL value. We want to perform checks similar to the default translator which
instead raises a "void value not ignored as it ought to be" error when
translating the example script.

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