file: output the correct buffer to the user

Regression brought by 7c312f84ea930d8 (April 2017)

CVE-2017-1000099

Bug: https://curl.haxx.se/docs/adv_20170809C.html

Credit to OSS-Fuzz for the discovery

diff --git a/lib/file.c b/lib/file.c
index bd426eac2c4a5bf8e6c317b535de1f54f5edce19..666cbe75be65ff4b3d209aed80ff9275cb7483a9 100644 (file)
--- a/lib/file.c
+++ b/lib/file.c
@@ -501,7 +501,7 @@ static CURLcode file_do(struct connectdata *conn, bool *done)
              tm->tm_hour,
              tm->tm_min,
              tm->tm_sec);
-    result = Curl_client_write(conn, CLIENTWRITE_BOTH, buf, 0);
+    result = Curl_client_write(conn, CLIENTWRITE_BOTH, header, 0);
     if(!result)
       /* set the file size to make it available post transfer */
       Curl_pgrsSetDownloadSize(data, expected_size);