ovl: port ovl_listxattr() to cred guard

Use the scoped ovl cred guard.

Link: https://patch.msgid.link/20251117-work-ovl-cred-guard-v4-32-b31603935724@kernel.org
Reviewed-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Christian Brauner <brauner@kernel.org>

diff --git a/fs/overlayfs/xattrs.c b/fs/overlayfs/xattrs.c
index 788182fff3e0eef5c3b809bbbaafc3975be0add4..aa95855c70237b3fc399ebf1bd96e94551cee332 100644 (file)
--- a/fs/overlayfs/xattrs.c
+++ b/fs/overlayfs/xattrs.c
@@ -109,12 +109,10 @@ ssize_t ovl_listxattr(struct dentry *dentry, char *list, size_t size)
        ssize_t res;
        size_t len;
        char *s;
-       const struct cred *old_cred;
        size_t prefix_len, name_len;
 
-       old_cred = ovl_override_creds(dentry->d_sb);
-       res = vfs_listxattr(realdentry, list, size);
-       ovl_revert_creds(old_cred);
+       with_ovl_creds(dentry->d_sb)
+               res = vfs_listxattr(realdentry, list, size);
        if (res <= 0 || size == 0)
                return res;