PR22186, divide-by-zero in decode_line_info

	PR 22186
	* dwarf2.c (decode_line_info): Fail on lh.line_range of zero
	rather than dividing by zero.

diff --git a/bfd/ChangeLog b/bfd/ChangeLog
index f63a8bb169442766b365be94c3d11e1afb7bfe96..e232764448dce1099bf88914d337286db07396e0 100644 (file)
--- a/bfd/ChangeLog
+++ b/bfd/ChangeLog
@@ -1,3 +1,9 @@
+2017-09-24  Alan Modra  <amodra@gmail.com>
+
+       PR 22186
+       * dwarf2.c (decode_line_info): Fail on lh.line_range of zero
+       rather than dividing by zero.
+
 2017-09-24  Alan Modra  <amodra@gmail.com>
 
        PR 22169

diff --git a/bfd/dwarf2.c b/bfd/dwarf2.c
index 89a3f9b183019fb8d92ba59584b6fb1429d72d55..8b2281ee86cfd2e3766f6970e28e2818d19e7f9d 100644 (file)
--- a/bfd/dwarf2.c
+++ b/bfd/dwarf2.c
@@ -2437,6 +2437,8 @@ decode_line_info (struct comp_unit *unit, struct dwarf2_debug *stash)
            case DW_LNS_set_basic_block:
              break;
            case DW_LNS_const_add_pc:
+             if (lh.line_range == 0)
+               goto line_fail;
              if (lh.maximum_ops_per_insn == 1)
                address += (lh.minimum_instruction_length
                            * ((255 - lh.opcode_base) / lh.line_range));