linux-kernel - [PATCH] fs/ntfs3: fix an error code in ntfs_get_acl

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Date:   Tue, 24 Aug 2021 14:48:58 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     Konstantin Komarov <almaz.alexandrovich@...agon-software.com>
Cc:     ntfs3@...ts.linux.dev, linux-kernel@...r.kernel.org,
        kernel-janitors@...r.kernel.org
Subject: [PATCH] fs/ntfs3: fix an error code in ntfs_get_acl_ex()

The ntfs_get_ea() function returns negative error codes or on success
it returns the length.  In the original code a zero length return was
treated as -ENODATA and results in a NULL return.  But it should be
treated as an invalid length and result in an PTR_ERR(-EINVAL) return.

Fixes: be71b5cba2e6 ("fs/ntfs3: Add attrib operations")
Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
---
I'm not super familiar with this code.  Please review this one
extra carefully.  I think it's theoretical because hopefully
ntfs_get_ea() doesn't ever return invalid lengths.

 fs/ntfs3/xattr.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/ntfs3/xattr.c b/fs/ntfs3/xattr.c
index 9239c388050e..e8ed38d0c4c9 100644
--- a/fs/ntfs3/xattr.c
+++ b/fs/ntfs3/xattr.c
@@ -521,7 +521,7 @@ static struct posix_acl *ntfs_get_acl_ex(struct user_namespace *mnt_userns,
 		ni_unlock(ni);
 
 	/* Translate extended attribute to acl */
-	if (err > 0) {
+	if (err >= 0) {
 		acl = posix_acl_from_xattr(mnt_userns, buf, err);
 		if (!IS_ERR(acl))
 			set_cached_acl(inode, type, acl);
-- 
2.20.1