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s390: Add r_offset check to the weak undef change

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Since we are accessing up to 2 bytes before the relocation target we
should better make sure there are actually 2 bytes before it.

ChangeLog:

	* bfd/elf64-s390.c (elf_s390_relocate_section): Make sure
	rel->r_offset is large enough.
This commit is contained in:
Andreas Krebbel 2024-02-27 15:24:06 +01:00
parent 5998b4a287
commit f1c4160786
1 changed files with 2 additions and 1 deletions
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3
bfd/elf64-s390.c
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@ -2486,7 +2486,8 @@ elf_s390_relocate_section (bfd *output_bfd,
&& !h->root.linker_def
&& (bfd_link_executable (info)
|| ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
&& r_type == R_390_PC32DBL)
&& r_type == R_390_PC32DBL
&& rel->r_offset >= 2)
{
void *insn_start = contents + rel->r_offset - 2;
uint16_t op = bfd_get_16 (input_bfd, insn_start) & 0xff0f;