linux-kernel - Re: [PATCH 1/1] infiniband: ulp/iser, fix error retval in iser_create_ib_conn

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Message-ID: <20100401153839.GA5265@bicker>
Date:	Thu, 1 Apr 2010 18:38:40 +0300
From:	Dan Carpenter <error27@...il.com>
To:	Roland Dreier <rdreier@...co.com>
Cc:	Jiri Slaby <jslaby@...e.cz>, linux-kernel@...r.kernel.org,
	jirislaby@...il.com, Or Gerlitz <ogerlitz@...taire.com>
Subject: Re: [PATCH 1/1] infiniband: ulp/iser, fix error retval in
	iser_create_ib_conn_res

On Wed, Mar 31, 2010 at 02:06:21PM -0700, Roland Dreier wrote:
> So looking at merging this finally, I think I see one problem with the
> proposed patch.  We have:
> 
>  > @@ -183,7 +180,7 @@  static int iser_create_ib_conn_res(struct iser_conn *ib_conn)
>  >  	ib_conn->fmr_pool = ib_create_fmr_pool(device->pd, &params);
>  >  	if (IS_ERR(ib_conn->fmr_pool)) {
>  >  		ret = PTR_ERR(ib_conn->fmr_pool);
>  > -		goto fmr_pool_err;
>  > +		goto out_err;
>  >  	}
> 
> and
> 
>  > @@ -209,12 +206,7 @@  static int iser_create_ib_conn_res(struct iser_conn *ib_conn)
>  >  		 ib_conn->fmr_pool, ib_conn->cma_id->qp);
>  >  	return ret;
>  >  
>  > -qp_err:
>  > -	(void)ib_destroy_fmr_pool(ib_conn->fmr_pool);
>  > -fmr_pool_err:
>  > -	kfree(ib_conn->page_vec);
>  > -	kfree(ib_conn->login_buf);
>  > -alloc_err:
>  > +out_err:
>  >  	iser_err("unable to alloc mem or create resource, err %d\n", ret);
>  >  	return ret;
>  >  }
> 
> so if ib_create_fmr_pool() fails, we're left with ib_conn->fmr_pool
> holding an error pointer, right?  But we're relying on
> iser_free_ib_conn_res() to clean up after us, and that has:
> 
> 	if (ib_conn->fmr_pool != NULL)
> 		ib_destroy_fmr_pool(ib_conn->fmr_pool);
> 
> so we're going to end up trying to free an error pointer, which will
> probably crash.
> 
> I think.
> 
> Dan or Or, am I wrong here or do we need another iteration of this
> patch? (the login_buf and page_vec changes do look correct to me, since
> a failed kmalloc() will leave us with a NULL pointer that it is safe to
> kfree() later)

You're right.  I missed that.

I will send an updated patch tomorrow.

regards,
dan carpenter

> 
>  - R.
> -- 
> Roland Dreier <rolandd@...co.com> || For corporate legal information go to:
> http://www.cisco.com/web/about/doing_business/legal/cri/index.html
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