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From: Dan Carpenter <dan.carpenter@oracle.com>
To: Konstantin Komarov <almaz.alexandrovich@paragon-software.com>
Cc: ntfs3@lists.linux.dev, linux-kernel@vger.kernel.org,
	kernel-janitors@vger.kernel.org
Subject: [PATCH] fs/ntfs3: fix an error code in ntfs_get_acl_ex()
Date: Tue, 24 Aug 2021 14:48:58 +0300	[thread overview]
Message-ID: <20210824114858.GH31143@kili> (raw)

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@oracle.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


             reply	other threads:[~2021-08-24 11:49 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-24 11:48 Dan Carpenter [this message]
2021-08-24 16:38 ` Kari Argillander
2021-08-24 17:07   ` Dan Carpenter
2021-08-27 17:17     ` Konstantin Komarov

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