[RFA] elfread.c (elf_symtab_read): Stop memory leak.

[Joel Brobecker]

> 2011-03-05  Michael Snyder  <msnyder@vmware.com>
> 
> 	* elfread.c (elf_symtab_read): Stop memory leak.

I think that's OK.  A little more nervous than usual, as I had
to look through a fair bit of code.  But you did run this change
past the testsuite, right?

Note that we could possibly be using alloca to avoid the use
of heap allocation.  However, as I have learnt the hard way
in the past, it's a really bad idea to do so in a loop (one
can exhaust the stack very effectively that way).

> Index: elfread.c
> ===================================================================
> RCS file: /cvs/src/src/gdb/elfread.c,v
> retrieving revision 1.103
> diff -u -p -r1.103 elfread.c
> --- elfread.c	7 Jan 2011 19:36:16 -0000	1.103
> +++ elfread.c	5 Mar 2011 20:33:20 -0000
> @@ -242,6 +242,7 @@ elf_symtab_read (struct objfile *objfile
>    char *filesymname = "";
>    struct dbx_symfile_info *dbx = objfile->deprecated_sym_stab_info;
>    int stripped = (bfd_get_symcount (objfile->obfd) == 0);
> +  struct cleanup *back_to = make_cleanup (null_cleanup, NULL);
>  
>    for (i = 0; i < number_of_symbols; i++)
>      {
> @@ -464,6 +465,7 @@ elf_symtab_read (struct objfile *objfile
>  				     * max_index));
>  			  sectinfo = (struct stab_section_info *)
>  			    xmalloc (size);
> +			  make_cleanup (xfree, sectinfo);
>  			  memset (sectinfo, 0, size);
>  			  sectinfo->num_sections = max_index;
>  			  if (filesym == NULL)
> @@ -572,6 +574,7 @@ elf_symtab_read (struct objfile *objfile
>  	    }
>  	}
>      }
> +  do_cleanups (back_to);
>  }
>  
>  struct build_id


-- 
Joel