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    Subject[PATCH 5.11 060/120] cifs: warn and fail if trying to use rootfs without the config option
    Date
    From: Aurelien Aptel <aaptel@suse.com>

    commit af3ef3b1031634724a3763606695ebcd113d782b upstream.

    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>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.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)

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