FTP: allow SIZE to fail when doing (resumed) upload

Added test 362 to verify.

Reported-by: Jordan Brown
Regression since 7ea2e1d0c5a7f (7.73.0)
Fixes #6715
Closes #6725

1 files changed, 6 insertions, 2 deletions

diff --git a/lib/ftp.c b/lib/ftp.c
index 56e7cf29e..8b347e34f 100644
--- a/lib/ftp.c
+++ b/lib/ftp.c
@@ -2309,8 +2309,12 @@ static CURLcode ftp_state_size_resp(struct Curl_easy *data,
 
   }
   else if(ftpcode == 550) { /* "No such file or directory" */
-    failf(data, "The file does not exist");
-    return CURLE_REMOTE_FILE_NOT_FOUND;
+    /* allow a SIZE failure for (resumed) uploads, when probing what command
+       to use */
+    if(instate != FTP_STOR_SIZE) {
+      failf(data, "The file does not exist");
+      return CURLE_REMOTE_FILE_NOT_FOUND;
+    }
   }
 
   if(instate == FTP_SIZE) {