[binutils-gdb] PR29807, SIGSEGV when linking fuzzed PE object

[Alan Modra]

https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=38c917d808fdb570ddb1215ccf8233a10484ba91

commit 38c917d808fdb570ddb1215ccf8233a10484ba91
Author: Alan Modra <amodra@gmail.com>
Date:   Sat Nov 19 08:33:20 2022 +1030

    PR29807, SIGSEGV when linking fuzzed PE object
    
            PR 29807
            * cofflink.c (_bfd_coff_generic_relocate_section): Skip relocs
            against symbols with a NULL section.

Diff:
---
 bfd/cofflink.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/bfd/cofflink.c b/bfd/cofflink.c
index a5b936fd7c1..cd117a445c6 100644
--- a/bfd/cofflink.c
+++ b/bfd/cofflink.c
@@ -2961,8 +2961,10 @@ _bfd_coff_generic_relocate_section (bfd *output_bfd,
 	      sec = sections[symndx];
 
 	      /* PR 19623: Relocations against symbols in
-		 the absolute sections should ignored.  */
-	      if (bfd_is_abs_section (sec))
+		 the absolute sections should ignored.
+		 PR 29807: Also ignore relocs against file symbols or
+		 other such nonsense in fuzzed objects.  */
+	      if (sec == NULL || bfd_is_abs_section (sec))
 		continue;
 
 	      val = (sec->output_section->vma