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bfd/elf-attrs.c: Fix possible infinite loop parsing attributes

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Handle the case of a zero length section or sub-section in
_bfd_elf_parse_attributes and in doing so prevent an infinite loop
in the parser.

bfd/ChangeLog:

2014-11-06  Will Newton  <will.newton@linaro.org>

	* elf-attrs.c (_bfd_elf_parse_attributes): Handle zero
	length sections and sub-sections.
This commit is contained in:
Will Newton
2014-11-05 15:24:30 +00:00
parent f321b03772
commit 1fe9dc4519
2 changed files with 9 additions and 0 deletions
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4
bfd/elf-attrs.c
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@@ -455,6 +455,8 @@ _bfd_elf_parse_attributes (bfd *abfd, Elf_Internal_Shdr * hdr)
section_len = bfd_get_32 (abfd, p);
p += 4;
if (section_len == 0)
break;
if (section_len > len)
section_len = len;
len -= section_len;
@@ -487,6 +489,8 @@ _bfd_elf_parse_attributes (bfd *abfd, Elf_Internal_Shdr * hdr)
p += n;
subsection_len = bfd_get_32 (abfd, p);
p += 4;
if (subsection_len == 0)
break;
if (subsection_len > section_len)
subsection_len = section_len;
section_len -= subsection_len;