From 431d48ef288983b62df2afb435dc8c6101a34cf8 Mon Sep 17 00:00:00 2001
From: Alan Modra <amodra@gmail.com>
Date: Sat, 6 Aug 2022 17:36:32 +0930
Subject: [PATCH] asan: segfault in coff_write_auxent_fname

More fuzzed input file nonsense.

	* coffgen.c (coff_write_symbol): Don't call coff_write_auxent_fname
	when extrap is NULL.
---
 bfd/coffgen.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/bfd/coffgen.c b/bfd/coffgen.c
index 07b3fb446aa..4d2b82e4a6f 100644
--- a/bfd/coffgen.c
+++ b/bfd/coffgen.c
@@ -1058,7 +1058,8 @@ coff_write_symbol (bfd *abfd,
 	  /* Adjust auxent only if this isn't the filename
 	     auxiliary entry.  */
 	  if (native->u.syment.n_sclass == C_FILE
-	      && (native + j + 1)->u.auxent.x_file.x_ftype)
+	      && (native + j + 1)->u.auxent.x_file.x_ftype
+	      && (native + j + 1)->extrap)
 	    coff_write_auxent_fname (abfd, (char *) (native + j + 1)->extrap,
 				     &(native + j + 1)->u.auxent, strtab, hash);