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From d8010d3e75ec7194a4703774090b27486b742d48 Mon Sep 17 00:00:00 2001
From: Alan Modra <amodra@gmail.com>
Date: Sun, 24 Sep 2017 14:36:48 +0930
Subject: [PATCH] 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.
Upstream-Status: Backport
Affects: <= 2.29.1
CVE: CVE-2017-15025
Signed-off-by: Armin Kuster <akuster@mvista.com>
---
bfd/ChangeLog | 6 ++++++
bfd/dwarf2.c | 2 ++
2 files changed, 8 insertions(+)
Index: git/bfd/dwarf2.c
===================================================================
--- git.orig/bfd/dwarf2.c
+++ git/bfd/dwarf2.c
@@ -2432,6 +2432,8 @@ decode_line_info (struct comp_unit *unit
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));
Index: git/bfd/ChangeLog
===================================================================
--- git.orig/bfd/ChangeLog
+++ git/bfd/ChangeLog
@@ -1,3 +1,10 @@
+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.
+
+
2017-09-25 Alan Modra <amodra@gmail.com>
PR 22200
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