[binutils-gdb] asan: mips_gprel_reloc segfault

[Alan Modra]

https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=679dc6e71647adf2719c411de5006358d27978b7

commit 679dc6e71647adf2719c411de5006358d27978b7
Author: Alan Modra <amodra@gmail.com>
Date:   Fri Jun 3 12:32:00 2022 +0930

    asan: mips_gprel_reloc segfault
    
    Not just the undefined section has a NULL owner, the absolute section
    has too.  Which means we can't find output_bfd for __gp.  Also, may as
    well test directly for output_bfd == NULL.
    
            * coff-mips.c (mips_gprel_reloc): Don't segfault on any of
            bfd_is_const_section sections.

Diff:
---
 bfd/coff-mips.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/bfd/coff-mips.c b/bfd/coff-mips.c
index 9614d338abe..d4dc1bd3c19 100644
--- a/bfd/coff-mips.c
+++ b/bfd/coff-mips.c
@@ -593,11 +593,10 @@ mips_gprel_reloc (bfd *abfd ATTRIBUTE_UNUSED,
     {
       relocatable = false;
       output_bfd = symbol->section->output_section->owner;
+      if (output_bfd == NULL)
+	return bfd_reloc_undefined;
     }
 
-  if (bfd_is_und_section (symbol->section) && ! relocatable)
-    return bfd_reloc_undefined;
-
   /* We have to figure out the gp value, so that we can adjust the
      symbol value correctly.  We look up the symbol _gp in the output
      BFD.  If we can't find it, we're stuck.  We cache it in the ECOFF