From: Timo Sirainen <timo.sirainen@open-xchange.com>
Date: Tue, 28 May 2019 10:35:11 +0000 (+0300)
Subject: lib: base64 - Change MAX_BASE64_DECODED_SIZE() to be more exact
X-Git-Tag: 2.3.8~147
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=f6c6fbe1ca16d23419bc08782dff34825dd8988b;p=thirdparty%2Fdovecot%2Fcore.git

lib: base64 - Change MAX_BASE64_DECODED_SIZE() to be more exact

If the input has only full base64 blocks (is divisible by 4), there's no
need to add the extra +3.
---

diff --git a/src/lib/base64.h b/src/lib/base64.h
index 0576f62e67..b497926f7f 100644
--- a/src/lib/base64.h
+++ b/src/lib/base64.h
@@ -28,5 +28,5 @@ bool base64_is_valid_char(char c);
 	((((size) + 2) / 3) * 4)
 /* max. buffer size required for base64_decode() */
 #define MAX_BASE64_DECODED_SIZE(size) \
-	((size) / 4 * 3 + 3)
+	(((size) + 3) / 4 * 3)
 #endif