PR25993, read of freed memory

ldmain.c:add_archive_element copies file name pointers from the bfd to
a lang_input_statement_type.
  input->filename = abfd->filename;
  input->local_sym_name = abfd->filename;
This results in stale pointers when twiddling the bfd filename in
places like the pe ld after_open.  So don't free the bfd filename,
and make copies using bfd_alloc memory that won't result in small
memory leaks that annoy memory checkers.

	PR 25993
bfd/
	* archive.c (_bfd_get_elt_at_filepos): Don't strdup filename,
	use bfd_set_filename.
	* elfcode.h (_bfd_elf_bfd_from_remote_memory): Likewise.
	* mach-o.c (bfd_mach_o_fat_member_init): Likewise.
	* opncls.c (bfd_fopen, bfd_openstreamr, bfd_openr_iovec, bfd_openw),
	(bfd_create): Likewise.
	(_bfd_delete_bfd): Don't free filename.
	(bfd_set_filename): Copy filename param to bfd_alloc'd memory,
	return pointer to the copy or NULL on alloc fail.
	* vms-lib.c (_bfd_vms_lib_get_module): Free newname and test
	result of bfd_set_filename.
	* bfd-in2.h: Regenerate.
gdb/
	* solib-darwin.c (darwin_bfd_open): Don't strdup pathname for
	bfd_set_filename.
	* solib-aix.c (solib_aix_bfd_open): Use std::string for name
	passed to bfd_set_filename.
	* symfile-mem.c (add_vsyscall_page): Likewise for string
	passed to symbol_file_add_from_memory.
	(symbol_file_add_from_memory): Make name param a const char* and
	don't strdup.
ld/
	* emultempl/pe.em (gld_${EMULATION_NAME}_after_open): Don't copy
	other_bfd_filename for bfd_set_filename, and test result of
	bfd_set_filename call.  Don't create a new is->filename, simply
	copy from bfd filename.  Free new_name after bfd_set_filename.
	* emultempl/pep.em (gld_${EMULATION_NAME}_after_open): Likewise.

1 files changed, 6 insertions, 0 deletions

diff --git a/bfd/vms-lib.c b/bfd/vms-lib.c
index 9504cf4..6a8a76e 100644
--- a/bfd/vms-lib.c
+++ b/bfd/vms-lib.c
@@ -1452,6 +1452,12 @@ _bfd_vms_lib_get_module (bfd *abfd, unsigned int modidx)
       break;
     }
   bfd_set_filename (res, newname);
+  free (newname);
+  if (bfd_get_filename (res) == NULL)
+    {
+      bfd_close (res);
+      return NULL;
+    }
 
   tdata->cache[modidx] = res;