From a69a4d222d661268e196d481a2a2b5c3c4cd6848 Mon Sep 17 00:00:00 2001
From: Daniel Stenberg <daniel@haxx.se>
Date: Tue, 3 Oct 2017 17:20:06 +0200
Subject: ftp: UBsan fixup 'pointer index expression overflowed'

Closes #1939
---
 lib/ftp.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

(limited to 'lib')

diff --git a/lib/ftp.c b/lib/ftp.c
index 54ba4057f..d7be88136 100644
--- a/lib/ftp.c
+++ b/lib/ftp.c
@@ -2419,8 +2419,8 @@ static CURLcode ftp_state_get_resp(struct connectdata *conn,
       char *bytes;
       char *buf = data->state.buffer;
       bytes = strstr(buf, " bytes");
-      if(bytes--) {
-        long in = (long)(bytes-buf);
+      if(bytes) {
+        long in = (long)(--bytes-buf);
         /* this is a hint there is size information in there! ;-) */
         while(--in) {
           /* scan for the left parenthesis and break there */
-- 
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