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    Subject[PATCH 4.20 323/352] cuse: fix ioctl
    Date
    4.20-stable review patch.  If anyone has any objections, please let me know.

    ------------------

    From: Miklos Szeredi <mszeredi@redhat.com>

    commit 8a3177db59cd644fde05ba9efee29392dfdec8aa upstream.

    cuse_process_init_reply() doesn't initialize fc->max_pages and thus all
    cuse bases ioctls fail with ENOMEM.

    Reported-by: Andreas Steinmetz <ast@domdv.de>
    Fixes: 5da784cce430 ("fuse: add max_pages to init_out")
    Cc: <stable@vger.kernel.org> # v4.20
    Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

    ---
    fs/fuse/inode.c | 2 +-
    1 file changed, 1 insertion(+), 1 deletion(-)

    --- a/fs/fuse/inode.c
    +++ b/fs/fuse/inode.c
    @@ -628,6 +628,7 @@ void fuse_conn_init(struct fuse_conn *fc
    get_random_bytes(&fc->scramble_key, sizeof(fc->scramble_key));
    fc->pid_ns = get_pid_ns(task_active_pid_ns(current));
    fc->user_ns = get_user_ns(user_ns);
    + fc->max_pages = FUSE_DEFAULT_MAX_PAGES_PER_REQ;
    }
    EXPORT_SYMBOL_GPL(fuse_conn_init);

    @@ -1162,7 +1163,6 @@ static int fuse_fill_super(struct super_
    fc->user_id = d.user_id;
    fc->group_id = d.group_id;
    fc->max_read = max_t(unsigned, 4096, d.max_read);
    - fc->max_pages = FUSE_DEFAULT_MAX_PAGES_PER_REQ;

    /* Used by get_root_inode() */
    sb->s_fs_info = fc;

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