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forked from pool/zlib
zlib/0001-Do-not-try-to-store-negative-values-in-unsigned-int.patch

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From bb5eec59e3ec66f6dccb79b1900aa806a1cca12e Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Tom=C3=A1=C5=A1=20Chv=C3=A1tal?= <tchvatal@suse.com>
Date: Fri, 8 Dec 2017 14:59:08 +0100
Subject: [PATCH] Do not try to store negative values in unsigned int
---
deflate.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/deflate.c b/deflate.c
index 1ec7614..1bad1eb 100644
--- a/deflate.c
+++ b/deflate.c
@@ -1536,7 +1536,10 @@ local void fill_window(s)
/* Initialize the hash value now that we have some input: */
if (s->lookahead + s->insert >= MIN_MATCH) {
- uInt str = s->strstart - s->insert;
+ uInt str = 0;
+ /* storing negative values to uInt is not good idea */
+ if (s->strstart - s->insert > 0)
+ str = s->strstart - s->insert;
s->ins_h = s->window[str];
UPDATE_HASH(s, s->ins_h, s->window[str + 1]);
#if MIN_MATCH != 3
--
2.15.1