[binutils-gdb] Set dwarf2 stash pointer earlier

[Alan Modra <amodra@sourceware.org>]

https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=8eacd95dd4406ae4021a6996c0c505648da75440

commit 8eacd95dd4406ae4021a6996c0c505648da75440
Author: Alan Modra <amodra@gmail.com>
Date:   Sun Jan 8 12:56:21 2023 +1030

    Set dwarf2 stash pointer earlier
    
    This fixes a memory leak in the vanishingly rare cases (found by
    fuzzers of course) when something goes wrong in the save_section_vma,
    htab_create_alloc or alloc_trie_leaf calls before *pinfo is written.
    If *pinfo is not written, _bfd_dwarf2_cleanup_debug_info won't be able
    to free that memory.
    
            * dwarf2.c (_bfd_dwarf2_slurp_debug_info): Save stash pointer
            on setting up stash.

Diff:
---
 bfd/dwarf2.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/bfd/dwarf2.c b/bfd/dwarf2.c
index f689eebbd88..bd431805d2a 100644
--- a/bfd/dwarf2.c
+++ b/bfd/dwarf2.c
@@ -5408,6 +5408,7 @@ _bfd_dwarf2_slurp_debug_info (bfd *abfd, bfd *debug_bfd,
       stash = (struct dwarf2_debug *) bfd_zalloc (abfd, amt);
       if (! stash)
 	return false;
+      *pinfo = stash;
     }
   stash->orig_bfd = abfd;
   stash->debug_sections = debug_sections;
@@ -5433,8 +5434,6 @@ _bfd_dwarf2_slurp_debug_info (bfd *abfd, bfd *debug_bfd,
   if (!stash->alt.trie_root)
     return false;
 
-  *pinfo = stash;
-
   if (debug_bfd == NULL)
     debug_bfd = abfd;