From: Yann Collet <cyan@fb.com>
Date: Tue, 22 Aug 2017 19:08:39 +0000 (-0700)
Subject: fixed extraordinary scenario where all fields use maximum possible nb of bits simulta... 
X-Git-Tag: fuzz-corpora2~44^2
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=refs%2Fpull%2F812%2Fhead;p=thirdparty%2Fzstd.git

fixed extraordinary scenario where all fields use maximum possible nb of bits simultaneously

can only happen if windowLog>=27  (level 22 --ultra)
---

diff --git a/lib/compress/zstd_compress.c b/lib/compress/zstd_compress.c
index 0322c03eb..66641e3d9 100644
--- a/lib/compress/zstd_compress.c
+++ b/lib/compress/zstd_compress.c
@@ -1131,7 +1131,7 @@ MEM_STATIC size_t ZSTD_encodeSequences(void* dst, size_t dstCapacity,
             BIT_addBits(&blockStream, sequences[n].litLength, llBits);
             if (MEM_32bits() && ((llBits+mlBits)>24)) BIT_flushBits(&blockStream);
             BIT_addBits(&blockStream, sequences[n].matchLength, mlBits);
-            if (MEM_32bits()) BIT_flushBits(&blockStream);                  /* (7)*/
+            if (MEM_32bits() || (ofBits+mlBits+llBits > 56)) BIT_flushBits(&blockStream);
             if (longOffsets) {
                 int const extraBits = ofBits - MIN(ofBits, STREAM_ACCUMULATOR_MIN-1);
                 if (extraBits) {