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Fixes for memory access violations triggered by running addr2line on fuzzed binaries.

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PR binutils/17512
	* addr2line.c (slurp_symtab): If the symcount is zero, free the
	symbol table pointer.

	* dwarf2.c (concat_filename): Check for an empty directory table.
	(scan_unit_for_symbols): Check for reading off the end of the
	unit.
	(parse_comp_unit): Check for a DW_AT_comp_dir attribute with a
	non-string form.
	* elf64-ppc.c (opd_entry_value): Fail if there are no relocs
	available.
This commit is contained in:
Nick Clifton
2015-01-27 15:49:12 +00:00
parent 37e3922eed
commit 877a8638ba
5 changed files with 38 additions and 1 deletions
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8
binutils/addr2line.c
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@@ -140,6 +140,14 @@ slurp_symtab (bfd *abfd)
syms = xmalloc (storage);
symcount = bfd_canonicalize_dynamic_symtab (abfd, syms);
}
/* PR 17512: file: 2a1d3b5b.
Do not pretend that we have some symbols when we don't. */
if (symcount <= 0)
{
free (syms);
syms = NULL;
}
}
/* These global variables are used to pass information between