From: Aki Tuomi <aki.tuomi@open-xchange.com>
Date: Mon, 18 Sep 2023 10:38:50 +0000 (+0300)
Subject: fs-compress: Limit minimum buffer size to 1k
X-Git-Tag: 2.4.0~1933
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=5a34d384d7adbb9b49be8adebb919e6274a34a8b;p=thirdparty%2Fdovecot%2Fcore.git

fs-compress: Limit minimum buffer size to 1k

Otherwise we might not get enough data to decompress
the stream.
---

diff --git a/src/plugins/fs-compress/fs-compress.c b/src/plugins/fs-compress/fs-compress.c
index 4d82f075a6..83afc87e51 100644
--- a/src/plugins/fs-compress/fs-compress.c
+++ b/src/plugins/fs-compress/fs-compress.c
@@ -10,6 +10,8 @@
 #include "compression.h"
 #include "fs-api-private.h"
 
+#define FS_COMPRESS_ISTREAM_MIN_BUFFER_SIZE 1024
+
 struct compress_fs {
 	struct fs fs;
 	const struct compression_handler *compress_handler;
@@ -173,7 +175,8 @@ fs_compress_read_stream(struct fs_file *_file, size_t max_buffer_size)
 		return file->input;
 	}
 
-	input = fs_read_stream(file->super_read, max_buffer_size);
+	input = fs_read_stream(file->super_read,
+		I_MAX(FS_COMPRESS_ISTREAM_MIN_BUFFER_SIZE, max_buffer_size));
 	if (file->fs->try_plain)
 		flags |= ISTREAM_DECOMPRESS_FLAG_TRY;
 	file->input = i_stream_create_decompress(input, flags);