libdw: Don't leak arange if we cannot figure out which CU it belongs to.

In the unlikely case that __libdw_findcu fails to find the associated
CU we would leak one arange because it wasn't linked into the arangelist
list yet. Make sure to free it immediately.

Signed-off-by: Mark Wielaard <mark@klomp.org>

diff --git a/libdw/ChangeLog b/libdw/ChangeLog
index f0ce901..661fa9d 100644 (file)
--- a/libdw/ChangeLog
+++ b/libdw/ChangeLog
@@ -1,5 +1,10 @@
 2018-06-05  Mark Wielaard  <mark@klomp.org>
 
+       * dwarf_getaranges (dwarf_getaranges): Free new_arange if
+       __libdw_findcu fails.
+
+2018-06-05  Mark Wielaard  <mark@klomp.org>
+
        * dwarf_getsrclines.c (read_srclines): Define dirarray early and
        check whether or not it is equal to dirstack on exit/out before
        cleanup.

diff --git a/libdw/dwarf_getaranges.c b/libdw/dwarf_getaranges.c
index 50a98cf..bff9c86 100644 (file)
--- a/libdw/dwarf_getaranges.c
+++ b/libdw/dwarf_getaranges.c
@@ -197,7 +197,12 @@ dwarf_getaranges (Dwarf *dbg, Dwarf_Aranges **aranges, size_t *naranges)
          /* We store the actual CU DIE offset, not the CU header offset.  */
          Dwarf_CU *cu = __libdw_findcu (dbg, offset, false);
          if (unlikely (cu == NULL))
-           goto fail;
+           {
+             /* We haven't gotten a chance to link in the new_arange
+                into the arangelist, don't leak it.  */
+             free (new_arange);
+             goto fail;
+           }
          new_arange->arange.offset = __libdw_first_die_off_from_cu (cu);
 
          new_arange->next = arangelist;