[PATCH 1/5] ntfs: return -EINVAL from ntfs_collate_ntofs_ulongs() on bad length

[Baolin Liu <liubaolin12138@163.com>]

From: Baolin Liu <liubaolin@kylinos.cn>

ntfs_collate_ntofs_ulongs() returns -1 when the key lengths differ or are
not a multiple of 4. But -1 is also what cmp_int() returns for "collates
before", so the error is indistinguishable from an ordinary result.

ntfs_ie_lookup() acts on that difference: it maps -EINVAL to -ERANGE, but
treats -1 as a tree-descent hint and breaks out of the loop. A malformed
entry in $Reparse/$R or $ObjId/$O is therefore silently taken as a lookup
miss.

Return -EINVAL, as the sibling ntfs_collate_ntofs_ulong() already does.
Well-formed keys are unaffected; both indexes use key sizes that are
multiples of 4.

Fixes: 5218cd102aec ("ntfs: update misc operations")
Signed-off-by: Baolin Liu <liubaolin@kylinos.cn>
---
 fs/ntfs/collate.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/ntfs/collate.c b/fs/ntfs/collate.c
index 77e34038902d..744fdfd7bf58 100644
--- a/fs/ntfs/collate.c
+++ b/fs/ntfs/collate.c
@@ -73,7 +73,7 @@ static int ntfs_collate_ntofs_ulongs(struct ntfs_volume *vol,
 
 	if (data1_len != data2_len || data1_len & 3) {
 		ntfs_error(vol->sb, "data1_len or data2_len not valid\n");
-		return -1;
+		return -EINVAL;
 	}
 
 	len = data1_len;
-- 
2.51.0