From fda7c28f8bd3f34cbd1984a3414926dbff940eea Mon Sep 17 00:00:00 2001
From: Bryan Cantrill <bryan@joyent.com>
Date: Tue, 7 Jun 2016 23:40:08 +0000
Subject: OS-5455 mdb can die on divide overflow Reviewed by: Robert Mustacchi
 <rm@joyent.com> Reviewed by: Patrick Mooney <patrick.mooney@joyent.com>

---
 usr/src/cmd/mdb/common/mdb/mdb_grammar.y | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

(limited to 'usr/src')

diff --git a/usr/src/cmd/mdb/common/mdb/mdb_grammar.y b/usr/src/cmd/mdb/common/mdb/mdb_grammar.y
index eda38203e5..97ea454627 100644
--- a/usr/src/cmd/mdb/common/mdb/mdb_grammar.y
+++ b/usr/src/cmd/mdb/common/mdb/mdb_grammar.y
@@ -25,7 +25,9 @@
  * Use is subject to license terms.
  */
 
-#pragma ident	"%Z%%M%	%I%	%E% SMI"
+/*
+ * Copyright (c) 2015, Joyent, Inc.  All rights reserved.
+ */
 
 #include <mdb/mdb_types.h>
 #include <mdb/mdb_debug.h>
@@ -297,6 +299,13 @@ expression:	expression '+' expression { $$ = $1 + $3; }
 			if ($3 == 0UL)
 				yyerror("attempted to divide by zero");
 
+			/*
+			 * Annoyingly, x86 generates a #DE when dividing
+			 * LONG_MIN by -1; check for this case explicitly.
+			 */
+			if ($1 == LONG_MIN && $3 == -1L)
+				yyerror("divide overflow");
+
 			$$ = (intmax_t)$1 / (intmax_t)$3;
 		}
 
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