code review 7965043: cmd/5l, cmd/6l, cmd/8l: fix segfault on reading LOCALS ...

src/cmd/8l/obj.c

 // Inferno utils/8l/obj.c
 // http://code.google.com/p/inferno-os/source/browse/utils/8l/obj.c
 //
 //      Copyright © 1994-1999 Lucent Technologies Inc.  All rights reserved.
 //      Portions Copyright © 1995-1997 C H Forsyth (forsyth@terzarima.net)
 //      Portions Copyright © 1997-1999 Vita Nuova Limited
 //      Portions Copyright © 2000-2007 Vita Nuova Holdings Limited (www.vitanuova.com)
 //      Portions Copyright © 2004,2006 Bruce Ellis
 //      Portions Copyright © 2005-2007 C H Forsyth (forsyth@terzarima.net)
 //      Revisions Copyright © 2000-2007 Lucent Technologies Inc. and others
@@ skipping 589 matching lines @@
                 savedata(s, p, pn);
                 unmal(p, sizeof *p);
                 goto loop;
 
         case AGOK:
                 diag("%s: GOK opcode in %s", pn, TNAME);
                 pc++;
                 goto loop;
 
         case ALOCALS:
+                if(skip)
+                        goto casdef;
                 cursym->locals = p->to.offset;
                 pc++;
                 goto loop;
 
         case ATYPE:
+                if(skip)
+                        goto casdef;
                 pc++;
                 goto loop;
 
         case ATEXT:
                 s = p->from.sym;
                 if(s->text != nil) {
                         if(p->from.scale & DUPOK) {
                                 skip = 1;
                                 goto casdef;
                         }
@@ skipping 148 matching lines @@
 appendp(Prog *q)
 {
         Prog *p;
 
         p = prg();
         p->link = q->link;
         q->link = p;
         p->line = q->line;
         return p;
 }