From: Alan Modra <amodra@gmail.com>
Date: Sun, 24 Sep 2017 05:06:48 +0000 (+0930)
Subject: PR22186, divide-by-zero in decode_line_info
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=d8010d3e75ec7194a4703774090b27486b742d48;p=binutils-gdb.git

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 f63a8bb1694..e232764448d 100644
--- 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 89a3f9b1830..8b2281ee86c 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));