linux-kernel - [PATCH 5.11 060/120] cifs: warn and fail if trying to use rootfs without the config option

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Date:   Mon, 22 Mar 2021 13:27:23 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Aurelien Aptel <aaptel@...e.com>,
        Steve French <stfrench@...rosoft.com>
Subject: [PATCH 5.11 060/120] cifs: warn and fail if trying to use rootfs without the config option

From: Aurelien Aptel <aaptel@...e.com>

commit af3ef3b1031634724a3763606695ebcd113d782b upstream.

If CONFIG_CIFS_ROOT is not set, rootfs mount option is invalid

Signed-off-by: Aurelien Aptel <aaptel@...e.com>
CC: <stable@...r.kernel.org> # v5.11
Signed-off-by: Steve French <stfrench@...rosoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 fs/cifs/fs_context.c |    6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

--- a/fs/cifs/fs_context.c
+++ b/fs/cifs/fs_context.c
@@ -1175,9 +1175,11 @@ static int smb3_fs_context_parse_param(s
 		pr_warn_once("Witness protocol support is experimental\n");
 		break;
 	case Opt_rootfs:
-#ifdef CONFIG_CIFS_ROOT
-		ctx->rootfs = true;
+#ifndef CONFIG_CIFS_ROOT
+		cifs_dbg(VFS, "rootfs support requires CONFIG_CIFS_ROOT config option\n");
+		goto cifs_parse_mount_err;
 #endif
+		ctx->rootfs = true;
 		break;
 	case Opt_posixpaths:
 		if (result.negated)