[binutils-gdb] bfd: Munmap readonly memory after bfd_free_cached_info

[H.J. Lu]

https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=37eac4810b66f165ed5bb837ac36c0eb9baba727

commit 37eac4810b66f165ed5bb837ac36c0eb9baba727
Author: H.J. Lu <hjl.tools@gmail.com>
Date:   Thu Apr 4 18:05:57 2024 -0700

    bfd: Munmap readonly memory after bfd_free_cached_info
    
    Munmap readonly memory after bfd_free_cached_info which may use munmapped
    readonly memory.
    
            PR ld/31608
            * opncls.c (_bfd_delete_bfd): Munmap readonly memory after
            bfd_free_cached_info.

Diff:
---
 bfd/opncls.c | 22 ++++++++++++----------
 1 file changed, 12 insertions(+), 10 deletions(-)

diff --git a/bfd/opncls.c b/bfd/opncls.c
index 5efec37175e..2f8a3a6c919 100644
--- a/bfd/opncls.c
+++ b/bfd/opncls.c
@@ -172,16 +172,6 @@ _bfd_delete_bfd (bfd *abfd)
 	  munmap (elf_section_data (sec)->contents_addr,
 		  elf_section_data (sec)->contents_size);
     }
-
-  struct bfd_mmapped *mmapped, *next;
-  for (mmapped = abfd->mmapped; mmapped != NULL; mmapped = next)
-    {
-      struct bfd_mmapped_entry *entries = mmapped->entries;
-      next = mmapped->next;
-      for (unsigned int i = 0; i < mmapped->next_entry; i++)
-	munmap (entries[i].addr, entries[i].size);
-      munmap (mmapped, _bfd_pagesize);
-    }
 #endif
 
   /* Give the target _bfd_free_cached_info a chance to free memory.  */
@@ -197,6 +187,18 @@ _bfd_delete_bfd (bfd *abfd)
   else
     free ((char *) bfd_get_filename (abfd));
 
+#ifdef USE_MMAP
+  struct bfd_mmapped *mmapped, *next;
+  for (mmapped = abfd->mmapped; mmapped != NULL; mmapped = next)
+    {
+      struct bfd_mmapped_entry *entries = mmapped->entries;
+      next = mmapped->next;
+      for (unsigned int i = 0; i < mmapped->next_entry; i++)
+	munmap (entries[i].addr, entries[i].size);
+      munmap (mmapped, _bfd_pagesize);
+    }
+#endif
+
   free (abfd->arelt_data);
   free (abfd);
 }