Fix linker error found when compiling glibc with a mismatched gcc.

* dwarf2.c (scan_unit_for_symbols, case DT_AT_location): Verify that
DW_OP_addr is only opcode in location before using it.

1 files changed, 11 insertions, 3 deletions

diff --git a/bfd/dwarf2.c b/bfd/dwarf2.c
index 2635a57..1348137 100644
--- a/bfd/dwarf2.c
+++ b/bfd/dwarf2.c
@@ -1782,9 +1782,17 @@ scan_unit_for_symbols (struct comp_unit *unit)
 		      if (*attr.u.blk->data == DW_OP_addr)
 			{
 			  var->stack = 0;
-			  var->addr = bfd_get ((attr.u.blk->size - 1) * 8,
-					       unit->abfd,
-					       attr.u.blk->data + 1);
+
+			  /* Verify that DW_OP_addr is the only opcode in the
+			     location, in which case the block size will be 1
+			     plus the address size.  */
+			  /* ??? For TLS variables, gcc can emit
+			     DW_OP_addr <addr> DW_OP_GNU_push_tls_address
+			     which we don't handle here yet.  */
+			  if (attr.u.blk->size == unit->addr_size + 1U)
+			    var->addr = bfd_get (unit->addr_size * 8,
+						 unit->abfd,
+						 attr.u.blk->data + 1);
 			}
 		      break;