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Fix compile time warnings about the possibility of using uninitialised fields in the Elf_Internal_Chdr structure when building readelf.

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* readelf.c (get_compression_header): Add ATTRIBUTE_WARN_UNUSED_RESULT.
	(process_section_headers): Check the return value from
	get_compression_header.
	(dump_section_as_strings): Likewise.
	(dump_section_as_bytes): Likewise.
	(load_specific_debug_section): Likewise.
This commit is contained in:
Nick Clifton 2020-03-20 11:33:07 +00:00
parent 3d98c46092
commit 5844b4657a
2 changed files with 34 additions and 9 deletions
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9
binutils/ChangeLog
View File

@ -1,3 +1,12 @@
2020-03-20 Nick Clifton <nickc@redhat.com>
* readelf.c (get_compression_header): Add ATTRIBUTE_WARN_UNUSED_RESULT.
(process_section_headers): Check the return value from
get_compression_header.
(dump_section_as_strings): Likewise.
(dump_section_as_bytes): Likewise.
(load_specific_debug_section): Likewise.
2020-03-20 H.J. Lu <hongjiu.lu@intel.com>
* ar.c (main): Update bfd_plugin_set_program_name call.

34
binutils/readelf.c
View File

@ -6076,7 +6076,7 @@ get_elf_section_flags (Filedata * filedata, bfd_vma sh_flags)
return buff;
}
static unsigned int
static unsigned int ATTRIBUTE_WARN_UNUSED_RESULT
get_compression_header (Elf_Internal_Chdr *chdr, unsigned char *buf, bfd_size_type size)
{
if (is_32bit_elf)
@ -6728,15 +6728,18 @@ process_section_headers (Filedata * filedata)
{
Elf_Internal_Chdr chdr;
(void) get_compression_header (&chdr, buf, sizeof (buf));
if (chdr.ch_type == ELFCOMPRESS_ZLIB)
printf (" ZLIB, ");
if (get_compression_header (&chdr, buf, sizeof (buf)) == 0)
printf (_(" [<corrupt>]\n"));
else
printf (_(" [<unknown>: 0x%x], "),
chdr.ch_type);
print_vma (chdr.ch_size, LONG_HEX);
printf (", %lu\n", (unsigned long) chdr.ch_addralign);
{
if (chdr.ch_type == ELFCOMPRESS_ZLIB)
printf (" ZLIB, ");
else
printf (_(" [<unknown>: 0x%x], "),
chdr.ch_type);
print_vma (chdr.ch_size, LONG_HEX);
printf (", %lu\n", (unsigned long) chdr.ch_addralign);
}
}
}
}
@ -13692,6 +13695,10 @@ dump_section_as_strings (Elf_Internal_Shdr * section, Filedata * filedata)
unsigned int compression_header_size
= get_compression_header (& chdr, (unsigned char *) start,
num_bytes);
if (compression_header_size == 0)
/* An error message will have already been generated
by get_compression_header. */
goto error_out;
if (chdr.ch_type != ELFCOMPRESS_ZLIB)
{
@ -13904,6 +13911,11 @@ dump_section_as_bytes (Elf_Internal_Shdr * section,
unsigned int compression_header_size
= get_compression_header (& chdr, start, section_size);
if (compression_header_size == 0)
/* An error message will have already been generated
by get_compression_header. */
goto error_out;
if (chdr.ch_type != ELFCOMPRESS_ZLIB)
{
warn (_("section '%s' has unsupported compress type: %d\n"),
@ -14237,6 +14249,10 @@ load_specific_debug_section (enum dwarf_section_display_enum debug,
}
compression_header_size = get_compression_header (&chdr, start, size);
if (compression_header_size == 0)
/* An error message will have already been generated
by get_compression_header. */
return FALSE;
if (chdr.ch_type != ELFCOMPRESS_ZLIB)
{