From: Aurelien Aptel <aaptel@suse.com>
Date: Thu, 18 Mar 2021 19:17:10 +0100
Subject: [PATCH] cifs: warn and fail if trying to use rootfs without the
config option
Git-commit: af3ef3b1031634724a3763606695ebcd113d782b
Patch-mainline: v5.12-rc4
References: bsc#1192606
If CONFIG_CIFS_ROOT is not set, rootfs mount option is invalid
Signed-off-by: Aurelien Aptel <aaptel@suse.com>
CC: <stable@vger.kernel.org> # v5.11
Signed-off-by: Steve French <stfrench@microsoft.com>
Acked-by: Enzo Matsumiya <ematsumiya@suse.de>
---
fs/cifs/fs_context.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/fs/cifs/fs_context.c b/fs/cifs/fs_context.c
index 892f51a21278..78889024a7ed 100644
--- a/fs/cifs/fs_context.c
+++ b/fs/cifs/fs_context.c
@@ -1196,9 +1196,11 @@ static int smb3_fs_context_parse_param(struct fs_context *fc,
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)
--
2.33.1