commit 431d48ef288983b62df2afb435dc8c6101a34cf8
author Alan Modra <amodra@gmail.com> Sat Aug 06 17:36:32 2022 +0930
committer Alan Modra <amodra@gmail.com> Sat Aug 06 18:43:24 2022 +0930
tree 1d1d49e0f1425c6beaf20d2a6feb01496f4a0343
parent f7a559d5e11c5c023554b48b661aabbcc2c87cb8

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

diff --git a/bfd/coffgen.c b/bfd/coffgen.c
index 07b3fb4..4d2b82e 100644
--- a/bfd/coffgen.c
+++ b/bfd/coffgen.c
@@ -1058,7 +1058,8 @@
 	  /* 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);