[PATCH 7.1 047/271] btrfs: lzo: add error message for invalid headers

7.1-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Qu Wenruo <[email protected]>

[ Upstream commit 1cb15b153c636096740519f62040ec6dc3e50aef ]

Inside btrfs we always pair -EUCLEAN error with an error message to
indicate which data is corrupted.

However there are 3 cases inside lzo decompression where there is no
error message for corrupted headers.

Add those missing error messages to show exactly where the corruption
is.

Signed-off-by: Qu Wenruo <[email protected]>
Reviewed-by: David Sterba <[email protected]>
Signed-off-by: David Sterba <[email protected]>
Stable-dep-of: 0fa78ef637de ("btrfs: lzo: reject inline extents without valid headers")
Signed-off-by: Sasha Levin <[email protected]>
---
 fs/btrfs/lzo.c | 15 ++++++++++++---
 1 file changed, 12 insertions(+), 3 deletions(-)

diff --git a/fs/btrfs/lzo.c b/fs/btrfs/lzo.c
index 6e4aa22853aba..1531adb117d15 100644
--- a/fs/btrfs/lzo.c
+++ b/fs/btrfs/lzo.c
@@ -552,17 +552,26 @@ int lzo_decompress(struct list_head *ws, const u8 *data_in,
 	size_t max_segment_len = workspace_buf_length(fs_info);
 	int ret;
 
-	if (unlikely(srclen < LZO_LEN || srclen > max_segment_len + LZO_LEN * 2))
+	if (unlikely(srclen < LZO_LEN || srclen > max_segment_len + LZO_LEN * 2)) {
+		btrfs_err(fs_info, "invalid lzo header length, has %zu expect (%u, %zu)",
+			  srclen, LZO_LEN, max_segment_len + LZO_LEN * 2);
 		return -EUCLEAN;
+	}
 
 	in_len = get_unaligned_le32(data_in);
-	if (unlikely(in_len != srclen))
+	if (unlikely(in_len != srclen)) {
+		btrfs_err(fs_info, "invalid lzo header length, has %zu expect %zu",
+			  in_len, srclen);
 		return -EUCLEAN;
+	}
 	data_in += LZO_LEN;
 
 	in_len = get_unaligned_le32(data_in);
-	if (unlikely(in_len != srclen - LZO_LEN * 2))
+	if (unlikely(in_len != srclen - LZO_LEN * 2)) {
+		btrfs_err(fs_info, "invalid lzo segment length, has %zu expect %zu",
+			  in_len, srclen - LZO_LEN * 2);
 		return -EUCLEAN;
+	}
 	data_in += LZO_LEN;
 
 	out_len = sectorsize;
-- 
2.53.0