From 6d6ad65b43efa17a825702297331fcb290445a18 Mon Sep 17 00:00:00 2001
From: Nick Clifton <nickc@redhat.com>
Date: Thu, 1 Dec 2016 10:38:40 +0000
Subject: Fix ICE in assembler when passed a corrupt input file.

	PR gas/20895
	* symbols.c (resolve_symbol_value): Gracefully handle erroneous
	symbolic expressions.
---
 gas/symbols.c | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

(limited to 'gas/symbols.c')

diff --git a/gas/symbols.c b/gas/symbols.c
index 9115d7e..66865e0 100644
--- a/gas/symbols.c
+++ b/gas/symbols.c
@@ -1429,7 +1429,16 @@ resolve_symbol_value (symbolS *symp)
 	    case O_gt:	left = left >  right ? ~ (offsetT) 0 : 0; break;
 	    case O_logical_and:	left = left && right; break;
 	    case O_logical_or:	left = left || right; break;
-	    default:		abort ();
+
+	    case O_illegal:
+	    case O_absent:
+	    case O_constant:
+	      /* See PR 20895 for a reproducer.  */
+	      as_bad (_("Invalid operation on symbol"));
+	      goto exit_dont_set_value;
+	      
+	    default:
+	      abort ();
 	    }
 
 	  final_val += symp->sy_frag->fr_address + left;
-- 
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