RISC-V: Fix linker crash in section symbol check.

Message ID 20190321221727.13531-1-jimw@sifive.com
State New
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  • RISC-V: Fix linker crash in section symbol check.
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Commit Message

Jim Wilson March 21, 2019, 10:17 p.m.
sym is only set for local symbols.  h is only set for global symbols.  Gas
won't let me create a global section symbol, but bfd appears to have some
support for that, and I can't rule out that other assemblers might do this.
So we need to support both, and verify sym and h are non-NULL before using.

Tested with cross build for 32/64-bit elf/linux.  There were no regressions.



	PR 24365
	* elfnn-riscv.c (riscv_elf_relocate_section): For STT_SECTION check,
	verify sym non-NULL before using.  Add identical check using h.
 bfd/elfnn-riscv.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)



diff --git a/bfd/elfnn-riscv.c b/bfd/elfnn-riscv.c
index 0a0ceb7930..bb114e59c7 100644
--- a/bfd/elfnn-riscv.c
+++ b/bfd/elfnn-riscv.c
@@ -2059,7 +2059,9 @@  riscv_elf_relocate_section (bfd *output_bfd,
 	     all relocs to update these addends.  This is also ambiguous, as
 	     we do allow offsets to be added to the target address, which are
 	     not to be used to find the auipc address.  */
-	  if ((ELF_ST_TYPE (sym->st_info) == STT_SECTION) && rel->r_addend)
+	  if (((sym != NULL && (ELF_ST_TYPE (sym->st_info) == STT_SECTION))
+	       || (h != NULL && h->type == STT_SECTION))
+	      && rel->r_addend)
 	      r = bfd_reloc_dangerous;