https://bugs.kde.org/show_bug.cgi?id=364413

--- Comment #1 from Mark Wielaard <m...@redhat.com> ---
Created attachment 99546
  --> https://bugs.kde.org/attachment.cgi?id=99546&action=edit
Proposed testcase and fix

When the last argument ss == NULL don't check whether it is valid and don't try
to copy the sigmask (which would crash because it is NULL), just pass through
the NULL sigmask to the kernel. Testcase provided by Paul Eggert in the
original bug report https://bugzilla.redhat.com/show_bug.cgi?id=1344082

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