[PATCH] Avoid divide by zero when reading invalid PDB archive

[Mark Harmstone]

As discovered by Alan Modra - see
https://sourceware.org/pipermail/binutils/2022-September/122878.html.

---
 bfd/pdb.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/bfd/pdb.c b/bfd/pdb.c
index 9a431c23b1f..0ce3bc46ac6 100644
--- a/bfd/pdb.c
+++ b/bfd/pdb.c
@@ -80,6 +80,12 @@ pdb_get_elt_at_index (bfd *abfd, symindex sym_index)
 
   block_size = bfd_getl32 (int_buf);
 
+  if (block_size == 0)
+    {
+      bfd_set_error (bfd_error_malformed_archive);
+      return NULL;
+    }
+
   /* Get block_map_addr.  */
 
   if (bfd_seek (abfd, 4 * sizeof (uint32_t), SEEK_CUR))
-- 
2.35.1