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PTR_ADD and NPTR_ADD for bfd.h

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This defines a couple of macros used to avoid ubsan complaints about
calculations involving NULL pointers.  PTR_ADD should be used in the
case where it is known that the offset is always zero with a NULL
pointer, and you'd like to know if a non-zero offset is ever used.
NPTR_ADD should be rarely used, but is defined for cases where a
non-zero offset is expected and should be ignored if the pointer is
NULL.

bfd/
	* bfd-in.h (PTR_ADD, NPTR_ADD): Define.
	* bfd-in2.h: Regenerate.
	* elf-eh-frame.c (adjust_eh_frame_local_symbols): Avoid NULL
	pointer calculations.
	* elflink.c (_bfd_elf_strip_zero_sized_dynamic_sections): Likewise.
	(bfd_elf_add_dt_needed_tag, elf_finalize_dynstr): Likewise.
	(elf_link_add_object_symbols, elf_link_input_bfd): Likewise.
	(bfd_elf_final_link, bfd_elf_gc_record_vtinherit): Likewise.
binutils/
	* objdump.c (disassemble_section): Use PTR_ADD for rel_ppend.
This commit is contained in:
Alan Modra
2021-09-02 09:04:52 +09:30
parent 76aa354424
commit 36f61bf2ad
5 changed files with 39 additions and 26 deletions
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2
binutils/objdump.c
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@@ -3208,7 +3208,7 @@ disassemble_section (bfd *abfd, asection *section, void *inf)
}
}
}
rel_ppend = rel_pp + rel_count;
rel_ppend = PTR_ADD (rel_pp, rel_count);
if (!bfd_malloc_and_get_section (abfd, section, &data))
{