From 1658ae75cd654524df727f8cbd2d889ab42ae592 Mon Sep 17 00:00:00 2001
From: Bimba Shrestha <bimbashrestha@fb.com>
Date: Tue, 7 Apr 2020 14:41:53 -0700
Subject: [PATCH] handling nil case for refprefix

---
 lib/compress/zstd_compress.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

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;
 }
 
-- 
2.47.2