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Fix illegal memory accesses trigeered when linking corrupt input files.

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PR 23055
	* aoutx.h (find_nearest_line): Check that the symbol name exists
	and is long enough, before attempting to see if it is for a .o
	file.
	* hash.c (bfd_hash_hash): Add an assertion that the string is not
	NULL.
	* linker.c (bfd_link_hash_lookup): Fail if the table or string are
	NULL.
	(_bfd_generic_link_add_archive_symbols): Fail if an archive entry
	has no name.
This commit is contained in:
Nick Clifton
2018-04-17 17:47:51 +01:00
parent c4a91159af
commit 808346fcfc
4 changed files with 24 additions and 3 deletions
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6
bfd/linker.c
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@@ -495,6 +495,9 @@ bfd_link_hash_lookup (struct bfd_link_hash_table *table,
{
struct bfd_link_hash_entry *ret;
if (table == NULL || string == NULL)
return NULL;
ret = ((struct bfd_link_hash_entry *)
bfd_hash_lookup (&table->table, string, create, copy));
@@ -941,6 +944,9 @@ _bfd_generic_link_add_archive_symbols
continue;
}
if (arsym->name == NULL)
goto error_return;
h = bfd_link_hash_lookup (info->hash, arsym->name,
FALSE, FALSE, TRUE);