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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/dwarf2.c b/bfd/dwarf2.c
index 89a3f9b..8b2281e 100644
--- 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));

-- 
Alan Modra
Australia Development Lab, IBM


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