From: Stephan Bosch <stephan.bosch@open-xchange.com>
Date: Wed, 16 Sep 2020 01:10:12 +0000 (+0200)
Subject: lib-mail: message-header-encode - Return immediately when len == 0 in message_header_... 
X-Git-Tag: 2.3.13~111
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=de56f9152b3767637e44f71b697fbbf2dad746fc;p=thirdparty%2Fdovecot%2Fcore.git

lib-mail: message-header-encode - Return immediately when len == 0 in message_header_encode_b/q().

Just to make sure. This shouldn't happen in the first place.
---

diff --git a/src/lib-mail/message-header-encode.c b/src/lib-mail/message-header-encode.c
index ff5b96d8e9..632f472603 100644
--- a/src/lib-mail/message-header-encode.c
+++ b/src/lib-mail/message-header-encode.c
@@ -61,6 +61,9 @@ void message_header_encode_q(const unsigned char *input, size_t len,
 {
 	size_t i, line_len_left;
 
+	if (len == 0)
+		return;
+
 	line_len_left = MIME_MAX_LINE_LEN - MIME_WRAPPER_LEN;
 
 	if (first_line_len >= MIME_MAX_LINE_LEN - MIME_WRAPPER_LEN - 3) {
@@ -112,6 +115,9 @@ void message_header_encode_b(const unsigned char *input, size_t len,
 {
 	size_t line_len, line_len_left, max;
 
+	if (len == 0)
+		return;
+
 	line_len = first_line_len;
 	if (line_len >= MIME_MAX_LINE_LEN - MIME_WRAPPER_LEN) {
 		str_append(output, "\n\t");