[RFA] Fix other memory leak in solib_target_current_sos

["Pierre Muller" <pierre.muller@ics-cnrs.unistra.fr>]

> -----Message d'origine-----
> De : gdb-patches-owner@sourceware.org [mailto:gdb-patches-
> owner@sourceware.org] De la part de Pedro Alves
> Envoyé : vendredi 14 décembre 2012 10:45
> À : Pierre Muller
> Cc : gdb-patches@sourceware.org
> Objet : Re: [RFA] Fix memory leak in windows_xfer_shared_libraries
> 
> On 12/14/2012 07:53 AM, Pierre Muller wrote:
> 
> >>>   I was also wondering if it would not be better to keep the obstack
in
> >>> between the two calls, but that would probably require some static
> >> variable
> >>> :(
> >>
> >> That'd be fine.  We actually do that in some cases in gdbserver, like
> >> handle_qxfer_threads and handle_qxfer_traceframe_info.  It just didn't
> >> look like worth it enough to bother when I initially wrote this.
> >
> >   I was wondering if this would become a problem if we later add support
> for
> > multiple inferior
> > for windows-nat
> 
> I don't think so.
> 
> >    I vaguely remember that I tried to achieve this a long time ago...
> 
> ISTR you had an archer branch for that and other Windows stuff.

  Oh, no...
  I completely forgot that :(
It's been a loooong  time since I last worked on that :(
> >
> >   Anyhow, the memory leak is gone at least!


  I found another leak, down the same line,
solib_target_current_sos
  calls target_read_stralloc
which as its name suggests allocates the result on the heap...
But that string was not freed in the current code...

  This patch fixes that leak.



2012-12-14  Pierre Muller  <muller@sourceware.org>

        * solib-target.c (solib_target_current_sos): Remove 'const'
        qualifier from type of library_document local variable to be
        able to free it and avoid a memory leak.

Index: src/gdb/solib-target.c
===================================================================
RCS file: /cvs/src/src/gdb/solib-target.c,v
retrieving revision 1.24
diff -u -p -r1.24 solib-target.c
--- src/gdb/solib-target.c      4 Jan 2012 08:17:11 -0000       1.24
+++ src/gdb/solib-target.c      14 Dec 2012 10:17:58 -0000
@@ -246,7 +246,7 @@ static struct so_list *
 solib_target_current_sos (void)
 {
   struct so_list *new_solib, *start = NULL, *last = NULL;
-  const char *library_document;
+  char *library_document;
   VEC(lm_info_p) *library_list;
   struct lm_info *info;
   int ix;
@@ -261,7 +261,10 @@ solib_target_current_sos (void)
   /* Parse the list.  */
   library_list = solib_target_parse_libraries (library_document);
   if (library_list == NULL)
-    return NULL;
+    {
+      xfree (library_document);
+      return NULL;
+    }

   /* Build a struct so_list for each entry on the list.  */
   for (ix = 0; VEC_iterate (lm_info_p, library_list, ix, info); ix++)
@@ -291,6 +294,9 @@ solib_target_current_sos (void)
   /* Free the library list, but not its members.  */
   VEC_free (lm_info_p, library_list);

+  /* Also free allocated library_document string.  */
+  xfree (library_document);
+
   return start;
 }