lkrg-users - use miss check, lead to null pointer crash

Message-ID: <65e6a8cc.5f9f.1730ee2646a.Coremail.hyouyan@126.com>
Date: Thu, 2 Jul 2020 17:36:24 +0800 (CST)
From: youyan <hyouyan@....com>
To: lkrg-users@...ts.openwall.com
Subject: use miss check, lead to null pointer crash

Hi lkrg team:
     In function p_ed_enforce_pcfi(),fellow code  miss check before use :
      p_frame.fp = *(unsigned long *)(p_fp - 12);
      p_frame.sp = *(unsigned long *)(p_fp - 8);
      p_frame.pc = *(unsigned long *)(p_fp - 4);
    above code will lead to null pointer crash.  This null pointer situation  exist LKRG complie by clang 8.0.
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