From: Bimba Shrestha <bimbashrestha@fb.com>
Date: Tue, 7 Apr 2020 21:41:53 +0000 (-0700)
Subject: handling nil case for refprefix
X-Git-Tag: v1.4.5^2~65^2
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=refs%2Fpull%2F2075%2Fhead;p=thirdparty%2Fzstd.git

handling nil case for refprefix
---

diff --git a/lib/compress/zstd_compress.c b/lib/compress/zstd_compress.c
index bb0a60072..6a3eb5af2 100644
--- a/lib/compress/zstd_compress.c
+++ b/lib/compress/zstd_compress.c
@@ -945,9 +945,11 @@ size_t ZSTD_CCtx_refPrefix_advanced(
 {
     RETURN_ERROR_IF(cctx->streamStage != zcss_init, stage_wrong);
     ZSTD_clearAllDicts(cctx);
-    cctx->prefixDict.dict = prefix;
-    cctx->prefixDict.dictSize = prefixSize;
-    cctx->prefixDict.dictContentType = dictContentType;
+    if (prefix != NULL && prefixSize > 0) {
+        cctx->prefixDict.dict = prefix;
+        cctx->prefixDict.dictSize = prefixSize;
+        cctx->prefixDict.dictContentType = dictContentType;
+    }
     return 0;
 }