Null pointer dereference in GCC 1.28

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1 total messages Started by Rob McMahon Sat, 24 Sep 1988 22:46

#1706

Author: Rob McMahon
Date: Sat, 24 Sep 1988 22:46

28 lines
1317 bytes

GCC 1.28 expr.c (expand_call) somewhere around line 3679:

  /* If the address for a structure value should be in memory,
     and it would go in memory if treated as an extra parameter,
     treat it that way.  */
  if (structure_value_addr && GET_CODE (struct_value_rtx) == MEM)
    {
      rtx tem;

      INIT_CUMULATIVE_ARGS (args_so_far, funtype);
      tem = FUNCTION_ARG (args_so_far, Pmode,
			  build_pointer_type (TREE_TYPE (funtype)), 1);
=>    if (GET_CODE (tem) == MEM)
	{

If FUNCTION_ARG returns 0, this causes an almost-null pointer dereference
(actually the gould assembler gives up on this, but that's another story ...)
Make that

      if (tem != 0 && GET_CODE (tem) == MEM)

?

Rob
-- 
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Rob McMahon, Computing Services, Warwick University, Coventry CV4 7AL, England

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