From 3599341dd611303ee9544839d30f603f606d1082 Mon Sep 17 00:00:00 2001
From: Daniel Stenberg <daniel@haxx.se>
Date: Wed, 28 Sep 2016 00:05:12 +0200
Subject: [PATCH] base64: check for integer overflow on large input

CVE-2016-8617

Bug: https://curl.haxx.se/docs/adv_20161102C.html
Reported-by: Cure53
---
 lib/base64.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/lib/base64.c b/lib/base64.c
index ad25459..204a227 100644
--- a/lib/base64.c
+++ b/lib/base64.c
@@ -188,10 +188,15 @@ static CURLcode base64_encode(const char *table64,
   *outlen = 0;
 
   if(!insize)
     insize = strlen(indata);
 
+#if SIZEOF_SIZE_T == 4
+  if(insize > UINT_MAX/4)
+    return CURLE_OUT_OF_MEMORY;
+#endif
+
   base64data = output = malloc(insize * 4 / 3 + 4);
   if(!output)
     return CURLE_OUT_OF_MEMORY;
 
   /*
-- 
2.9.3