File evolution-data-server-boo1182882.patch of Package evolution-data-server.18659

From b0731961dca6ca2ee4a11b708545d58ff4948093 Mon Sep 17 00:00:00 2001
From: Milan Crha <mcrha@redhat.com>
Date: Tue, 2 Mar 2021 12:26:09 +0100
Subject: [PATCH] Allocate large-enough buffer for g_base64_decode_step()

---
 src/camel/camel-mime-filter-basic.c | 8 ++------
 src/camel/camel-mime-utils.c        | 2 +-
 2 files changed, 3 insertions(+), 7 deletions(-)

diff --git a/src/camel/camel-mime-filter-basic.c b/src/camel/camel-mime-filter-basic.c
index b13276264..8187fabd4 100644
--- a/src/camel/camel-mime-filter-basic.c
+++ b/src/camel/camel-mime-filter-basic.c
@@ -83,8 +83,7 @@ mime_filter_basic_filter (CamelMimeFilter *mime_filter,
 		g_return_if_fail (newlen <= (len + 2) * 2 + 62);
 		break;
 	case CAMEL_MIME_FILTER_BASIC_BASE64_DEC:
-		/* output can't possibly exceed the input size */
-		camel_mime_filter_set_size (mime_filter, len + 3, FALSE);
+		camel_mime_filter_set_size (mime_filter, (len * 3 / 4) + 3, FALSE);
 		newlen = g_base64_decode_step (
 			in, len,
 			(guchar *) mime_filter->outbuf,
@@ -225,10 +224,7 @@ mime_filter_basic_complete (CamelMimeFilter *mime_filter,
 		g_return_if_fail (newlen <= (len + 2) * 2 + 62);
 		break;
 	case CAMEL_MIME_FILTER_BASIC_BASE64_DEC:
-		/* Output can't possibly exceed the input size, but add 1,
-		   to make sure the mime_filter->outbuf will not be NULL,
-		   in case the input stream is empty. */
-		camel_mime_filter_set_size (mime_filter, len + 1, FALSE);
+		camel_mime_filter_set_size (mime_filter, (len * 3 / 4) + 3, FALSE);
 		newlen = g_base64_decode_step (
 			in, len,
 			(guchar *) mime_filter->outbuf,
diff --git a/src/camel/camel-mime-utils.c b/src/camel/camel-mime-utils.c
index 3394707e2..31024f5d4 100644
--- a/src/camel/camel-mime-utils.c
+++ b/src/camel/camel-mime-utils.c
@@ -1186,7 +1186,7 @@ rfc2047_decode_word (const gchar *in,
 	case 'B':
 	case 'b':
 		inptr += 2;
-		decoded = g_alloca (inend - inptr);
+		decoded = g_alloca (((inend - inptr) * 3 / 4) + 3);
 		declen = g_base64_decode_step ((gchar *) inptr, inend - inptr, decoded, &state, &save);
 		break;
 	case 'Q':
-- 
2.30.1
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