asan: NULL dereference in som_set_reloc_info

	* som.c (som_set_reloc_info): Ignore non-existent previous
	fixup references.

diff --git a/bfd/som.c b/bfd/som.c
index d33ad67561a0c9c62ea22630904a0ad71a3b84fe..c22f13b5a4c7342446c971f121c5916df29afc5e 100644 (file)
--- a/bfd/som.c
+++ b/bfd/som.c
@@ -4978,6 +4978,11 @@ som_set_reloc_info (unsigned char *fixup,
       /* Handle a request for a previous fixup.  */
       if (*fp->format == 'P')
        {
+         if (!reloc_queue[fp->D].reloc)
+           /* The back-reference doesn't exist.  This is a broken
+              object file, likely fuzzed.  Just ignore the fixup.  */
+           continue;
+
          /* Get pointer to the beginning of the prev fixup, move
             the repeated fixup to the head of the queue.  */
          fixup = reloc_queue[fp->D].reloc;