[patch/hpux] hpread.c: init alloca'd memory, pr gdb/1661

[mec.gnu@mindspring.com (Michael Elizabeth Chastain)]

This patch fixes some uninitialized memory in the HP symbol
table reader.  See PR symtab/1661.

I tested this on native hppa2.0w-hp-hpux11.11 with hpcc
B.11.11.28706.GP and hpacc A.03.45.

MAINTAINERS says that "Any [past] maintainer" can modify the hp/ux
symtab reader, so I'm going to commit this in 24 hours if nobody
objects.  After that, I am also going to test it on gdb_6_1-branch
and commit it to gdb_6_1-branch.

Michael C

2004-05-31  Michael Chastain  <mec.gnu@mindspring.com>

	Fix PR symtab/1661.
	* hpread.c (hpread_pxdb_needed): Call memset after alloca.
	(hpread_read_struct_type): Likewise.

Index: hpread.c
===================================================================
RCS file: /cvs/src/src/gdb/hpread.c,v
retrieving revision 1.48
diff -c -3 -p -r1.48 hpread.c
*** hpread.c	7 May 2004 05:48:49 -0000	1.48
--- hpread.c	31 May 2004 02:04:14 -0000
*************** hpread_pxdb_needed (bfd *sym_bfd)
*** 383,388 ****
--- 383,389 ----
        if (header_section_size == (bfd_size_type) sizeof (DOC_info_PXDB_header))
  	{
  	  buf = alloca (sizeof (DOC_info_PXDB_header));
+ 	  memset (buf, 0, sizeof (DOC_info_PXDB_header));
  
  	  if (!bfd_get_section_contents (sym_bfd,
  					 header_section,
*************** hpread_pxdb_needed (bfd *sym_bfd)
*** 450,455 ****
--- 451,457 ----
  	{
  
  	  buf = alloca (sizeof (PXDB_header));
+ 	  memset (buf, 0, sizeof (PXDB_header));
  	  if (!bfd_get_section_contents (sym_bfd,
  					 header_section,
  					 buf, 0,
*************** hpread_read_struct_type (dnttpointer hp_
*** 3686,3691 ****
--- 3688,3694 ----
  
  	  /* Get space to record the next field/data-member. */
  	  new = (struct nextfield *) alloca (sizeof (struct nextfield));
+ 	  memset (new, 0, sizeof (struct nextfield));
  	  new->next = list;
  	  list = new;
  
*************** hpread_read_struct_type (dnttpointer hp_
*** 3764,3769 ****
--- 3767,3773 ----
  	  n_templ_args++;
  	  /* Allocate and fill in a struct next_template */
  	  t_new = (struct next_template *) alloca (sizeof (struct next_template));
+ 	  memset (t_new, 0, sizeof (struct next_template));
  	  t_new->next = t_list;
  	  t_list = t_new;
  	  t_list->arg.name = VT (objfile) + fieldp->dtempl_arg.name;
*************** hpread_read_struct_type (dnttpointer hp_
*** 3904,3909 ****
--- 3908,3914 ----
  		  /* Get space to record this member function */
  		  /* Note: alloca used; this will disappear on routine exit */
  		  fn_new = (struct next_fn_field *) alloca (sizeof (struct next_fn_field));
+ 		  memset (fn_new, 0, sizeof (struct next_fn_field));
  		  fn_new->next = fn_list;
  		  fn_list = fn_new;
  
*************** hpread_read_struct_type (dnttpointer hp_
*** 4021,4026 ****
--- 4026,4032 ----
  
  	      /* Get space to record this static member */
  	      new = (struct nextfield *) alloca (sizeof (struct nextfield));
+ 	      memset (new, 0, sizeof (struct nextfield));
  	      new->next = list;
  	      list = new;
  
*************** hpread_read_struct_type (dnttpointer hp_
*** 4051,4056 ****
--- 4057,4063 ----
  		warning ("Debug info inconsistent: FIELD of anonymous union doesn't have a_union bit set");
  	      /* Get space to record the next field/data-member. */
  	      new = (struct nextfield *) alloca (sizeof (struct nextfield));
+ 	      memset (new, 0, sizeof (struct nextfield));
  	      new->next = list;
  	      list = new;
  
*************** hpread_read_struct_type (dnttpointer hp_
*** 4082,4087 ****
--- 4089,4095 ----
  		warning ("Debug info inconsistent: SVAR field in anonymous union doesn't have a_union bit set");
  	      /* Get space to record the next field/data-member. */
  	      new = (struct nextfield *) alloca (sizeof (struct nextfield));
+ 	      memset (new, 0, sizeof (struct nextfield));
  	      new->next = list;
  	      list = new;
  
*************** hpread_read_struct_type (dnttpointer hp_
*** 4102,4107 ****
--- 4110,4116 ----
  		warning ("Debug info inconsistent: DVAR field in anonymous union doesn't have a_union bit set");
  	      /* Get space to record the next field/data-member. */
  	      new = (struct nextfield *) alloca (sizeof (struct nextfield));
+ 	      memset (new, 0, sizeof (struct nextfield));
  	      new->next = list;
  	      list = new;
  
*************** hpread_read_struct_type (dnttpointer hp_
*** 4150,4155 ****
--- 4159,4165 ----
  
  	  /* Get space to record the next field/data-member. */
  	  new = (struct nextfield *) alloca (sizeof (struct nextfield));
+ 	  memset (new, 0, sizeof (struct nextfield));
  	  new->next = list;
  	  list = new;
  
*************** hpread_read_struct_type (dnttpointer hp_
*** 4233,4238 ****
--- 4243,4249 ----
  	    break;
  
  	  i_new = (struct next_instantiation *) alloca (sizeof (struct next_instantiation));
+ 	  memset (i_new, 0, sizeof (struct next_instantiation));
  	  i_new->next = i_list;
  	  i_list = i_new;
  	  i_list->t = hpread_type_lookup (field, objfile);