From: Nathan Moinvaziri <nathan@nathanm.com>
Date: Thu, 27 May 2021 17:27:09 +0000 (-0700)
Subject: Fixed trying to uncompress after compressing in gzip direct mode which is not support... 
X-Git-Tag: 2.0.4~12
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=59306efa92411d7d70e1be5fa6c600a2f994bb0f;p=thirdparty%2Fzlib-ng.git

Fixed trying to uncompress after compressing in gzip direct mode which is not supported by gz functions.
https://oss-fuzz.com/testcase-detail/6194422837542912
---

diff --git a/test/fuzz/minigzip_fuzzer.c b/test/fuzz/minigzip_fuzzer.c
index 6703ac58f..0c7a79a7d 100644
--- a/test/fuzz/minigzip_fuzzer.c
+++ b/test/fuzz/minigzip_fuzzer.c
@@ -295,7 +295,12 @@ int LLVMFuzzerTestOneInput(const uint8_t *data, size_t dataLen) {
     }
 
     file_compress(inFileName, outmode);
-    file_uncompress(outFileName);
+
+    /* gzopen does not support reading in direct mode */
+    if (outmode[3] == 'T')
+        inFileName = outFileName;
+    else
+        file_uncompress(outFileName);
 
     /* Check that the uncompressed file matches the input data. */
     in = fopen(inFileName, "rb");