From: Timofey Titovets <nefelim4ag@gmail.com>
Date: Mon, 29 May 2017 23:18:04 +0000 (+0300)
Subject: Btrfs: lzo: compressed data size must be less then input size
X-Git-Tag: v4.13-rc1~150^2~67
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=1e9d7291e50178699b87656488912eba235c7679;p=karo-tx-linux.git

Btrfs: lzo: compressed data size must be less then input size

Logic already skips if compression makes data bigger, let's sync lzo
with zlib and also return error if compressed size is equal to
input size.

Signed-off-by: Timofey Titovets <nefelim4ag@gmail.com>
Reviewed-by: David Sterba <dsterba@suse.com>
[ update changelog ]
Signed-off-by: David Sterba <dsterba@suse.com>
---

diff --git a/fs/btrfs/lzo.c b/fs/btrfs/lzo.c
index a554856a5f8a..7e8b0d6a7961 100644
--- a/fs/btrfs/lzo.c
+++ b/fs/btrfs/lzo.c
@@ -230,8 +230,10 @@ static int lzo_compress_pages(struct list_head *ws,
 		in_len = min(bytes_left, PAGE_SIZE);
 	}
 
-	if (tot_out > tot_in)
+	if (tot_out >= tot_in) {
+		ret = -E2BIG;
 		goto out;
+	}
 
 	/* store the size of all chunks of compressed data */
 	cpage_out = kmap(pages[0]);