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>
This commit is contained in:
Timofey Titovets 2017-05-30 02:18:04 +03:00 committed by David Sterba
parent 054ec2f626
commit 1e9d7291e5

View File

@ -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]);