From 2926e4297053c735ab65450192dfba32a4f47fa9 Mon Sep 17 00:00:00 2001
From: Dan Carpenter <dan.carpenter@oracle.com>
Date: Tue, 24 Aug 2021 14:48:58 +0300
Subject: [Backport 2926e4297053] src: 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 ("src: Add attrib operations")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Konstantin Komarov <almaz.alexandrovich@paragon-software.com>
---
 src/xattr.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/xattr.c b/src/xattr.c
index af89e50f7b9f32926e4daaea9f8b729916519526..d3d5b9d331d1f55010843085738cf395b640eb0b 100644
--- a/src/xattr.c
+++ b/src/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);
-- 
2.31.1