[PATCH] xtensa: fix gas segfault with --text-section-literals

[Max Filippov]

When --text-section-literals is used and code in the .init or .fini
emits literal in the absence of .literal_position, xtensa_move_literals
segfaults.

Check that search_frag is non-NULL in the xtensa_move_literals and
report error otherwise.

2015-05-17  Max Filippov  <jcmvbkbc@gmail.com>
gas/
	* config/tc-xtensa.c (xtensa_move_literals): Check that
	search_frag is non-NULL. Report error if literal frag is not
	found.
---
 gas/config/tc-xtensa.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/gas/config/tc-xtensa.c b/gas/config/tc-xtensa.c
index 31c0b6b..18307c1 100644
--- a/gas/config/tc-xtensa.c
+++ b/gas/config/tc-xtensa.c
@@ -10808,13 +10808,21 @@ xtensa_move_literals (void)
       frchain_to = NULL;
       frag_splice = &(frchain_from->frch_root);
 
-      while (!search_frag->tc_frag_data.literal_frag)
+      while (search_frag && !search_frag->tc_frag_data.literal_frag)
 	{
 	  gas_assert (search_frag->fr_fix == 0
 		  || search_frag->fr_type == rs_align);
 	  search_frag = search_frag->fr_next;
 	}
 
+      if (!search_frag)
+	{
+	  search_frag = frchain_from->frch_root;
+	  as_bad_where (search_frag->fr_file, search_frag->fr_line,
+			_("literal pool location required for text-section-literals; specify with .literal_position"));
+	  continue;
+	}
+
       gas_assert (search_frag->tc_frag_data.literal_frag->fr_subtype
 	      == RELAX_LITERAL_POOL_BEGIN);
       xtensa_switch_section_emit_state (&state, segment->seg, 0);
-- 
1.8.1.4