File curl-CVE-2019-3823.patch of Package curl.17565

From 89dd3f49e1248d7f39401ecc9eecb4e82885e629 Mon Sep 17 00:00:00 2001
From: Daniel Gustafsson <daniel@yesql.se>
Date: Sat, 19 Jan 2019 00:42:47 +0100
Subject: [PATCH 3/3] smtp: avoid risk of buffer overflow in strtol

If the incoming len 5, but the buffer does not have a termination
after 5 bytes, the strtol() call may keep reading through the line
buffer until is exceeds its boundary. Fix by ensuring that we are
using a bounded read with a temporary buffer on the stack.

Reported-by: Brian Carpenter (Geeknik Labs)
---
 lib/smtp.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/lib/smtp.c b/lib/smtp.c
index 84fc68e41..d55647b12 100644
--- a/lib/smtp.c
+++ b/lib/smtp.c
@@ -3,11 +3,11 @@
  *  Project                     ___| | | |  _ \| |
  *                             / __| | | | |_) | |
  *                            | (__| |_| |  _ <| |___
  *                             \___|\___/|_| \_\_____|
  *
- * Copyright (C) 1998 - 2018, Daniel Stenberg, <daniel@haxx.se>, et al.
+ * Copyright (C) 1998 - 2019, Daniel Stenberg, <daniel@haxx.se>, et al.
  *
  * This software is licensed as described in the file COPYING, which
  * you should have received as part of this distribution. The terms
  * are also available at https://curl.haxx.se/docs/copyright.html.
  *
@@ -205,12 +205,16 @@ static bool smtp_endofresp(struct connectdata *conn, char *line, size_t len,
   /* Do we have a command response? This should be the response code followed
      by a space and optionally some text as per RFC-5321 and as outlined in
      Section 4. Examples of RFC-4954 but some e-mail servers ignore this and
      only send the response code instead as per Section 4.2. */
   if(line[3] == ' ' || len == 5) {
+    char tmpline[6];
+
     result = TRUE;
-    *resp = curlx_sltosi(strtol(line, NULL, 10));
+    memset(tmpline, '\0', sizeof(tmpline));
+    memcpy(tmpline, line, (len == 5 ? 5 : 3));
+    *resp = curlx_sltosi(strtol(tmpline, NULL, 10));
 
     /* Make sure real server never sends internal value */
     if(*resp == 1)
       *resp = 0;
   }
-- 
2.20.1
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