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

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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
1 changed files with 3 additions and 1 deletions
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4
fs/btrfs/lzo.c
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@ -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]);