From 0d218be8319b896af187fdff7a24467d2d124845 Mon Sep 17 00:00:00 2001
From: dim <dim@FreeBSD.org>
Date: Mon, 7 Sep 2015 20:55:14 +0000
Subject: In libz's inflateMark(), avoid left-shifting a negative integer,
 which is undefined.

Reviewed by:	delphij
Differential Revision: https://reviews.freebsd.org/D3344
MFC after:	3 days
---
 lib/libz/inflate.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/libz/inflate.c b/lib/libz/inflate.c
index 870f89b..b51a8a5 100644
--- a/lib/libz/inflate.c
+++ b/lib/libz/inflate.c
@@ -1504,7 +1504,7 @@ z_streamp strm;
 {
     struct inflate_state FAR *state;
 
-    if (strm == Z_NULL || strm->state == Z_NULL) return -1L << 16;
+    if (strm == Z_NULL || strm->state == Z_NULL) return -(1L << 16);
     state = (struct inflate_state FAR *)strm->state;
     return ((long)(state->back) << 16) +
         (state->mode == COPY ? state->length :
-- 
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