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Re: [pr/17940] bfd/dwarf2.c: fix overflow bug in .dwarf_line

From: Nicholas Clifton <nickc at redhat dot com>
To: DJ Delorie <dj at redhat dot com>, binutils at sourceware dot org
Date: Mon, 23 Feb 2015 17:10:22 +0000
Subject: Re: [pr/17940] bfd/dwarf2.c: fix overflow bug in .dwarf_line
Authentication-results: sourceware.org; auth=none
References: <201502120646 dot t1C6kigl020466 at greed dot delorie dot com>

Hi DJ,

If you have an unlinked object compiled with -ftext-sections,
you get:

RELOCATION RECORDS FOR [.debug_line]:
OFFSET   TYPE              VALUE
00000000 R_MSP430_ABS32    .debug_line_end-0x00000004

with .debug_line_end undefined (i.e. has a value of zero), which
results in -4 (0xfffffffc) being stored during "simple_reloc".  This
is interpreted as a very large positive number.  This patch checks for
that special case, and arbitrary overflow cases.  OK?


Can you provide a testcase to go along with this patch please ?

Cheers
  Nick

Follow-Ups:
- Re: [pr/17940] bfd/dwarf2.c: fix overflow bug in .dwarf_line
  - From: DJ Delorie

References:
- [pr/17940] bfd/dwarf2.c: fix overflow bug in .dwarf_line
  - From: DJ Delorie

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