Re: general protection fault in relay_open_buf

[Tetsuo Handa]

On 2019/01/31 19:51, Greg KH wrote:
> Can you test the patch below?

You can ask syzbot to test the patch. But

> @@ -461,7 +463,7 @@ static struct rchan_buf *relay_open_buf(struct rchan *chan, unsigned int cpu)
>  		dentry = chan->cb->create_buf_file(NULL, NULL,
>  						   S_IRUSR, buf,
>  						   &chan->is_global);
> -		if (WARN_ON(dentry))
> +		if (IS_ERR_OR_NULL(dentry))
>  			goto free_buf;

are you trying to fix a different bug together that old code was by error bailing
out when chan->cb->create_buf_file() returned a valid "struct dentry *" ?
I don't know what WARN_ON() due to a valid "struct dentry *" means...

>  	}
>  
>