linux-kernel - Re: [PATCH net-next] qed: Set error code for allocation failures

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Date:   Fri, 27 Oct 2017 14:52:52 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     Yunsheng Lin <linyunsheng@...wei.com>
Cc:     Ariel Elior <Ariel.Elior@...ium.com>, everest-linux-l2@...ium.com,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        kernel-janitors@...r.kernel.org
Subject: Re: [PATCH net-next] qed: Set error code for allocation failures

On Fri, Oct 27, 2017 at 05:32:42PM +0800, Yunsheng Lin wrote:
> Hi, Dan
> 
> On 2017/10/27 14:40, Dan Carpenter wrote:
> > There are several places where we accidentally return success when
> > kcalloc() fails.
> > 
> > Fixes: fcb39f6c10b2 ("qed: Add mpa buffer descriptors for storing and processing mpa fpdus")
> > Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
> > 
> > diff --git a/drivers/net/ethernet/qlogic/qed/qed_iwarp.c b/drivers/net/ethernet/qlogic/qed/qed_iwarp.c
> > index 409041eab189..6366f2ef82b7 100644
> > --- a/drivers/net/ethernet/qlogic/qed/qed_iwarp.c
> > +++ b/drivers/net/ethernet/qlogic/qed/qed_iwarp.c
> > @@ -2585,7 +2585,7 @@ qed_iwarp_ll2_start(struct qed_hwfn *p_hwfn,
> >  	struct qed_ll2_cbs cbs;
> >  	u32 mpa_buff_size;
> >  	u16 n_ooo_bufs;
> > -	int rc = 0;
> > +	int rc;
> >  	int i;
> >  
> >  	iwarp_info = &p_hwfn->p_rdma_info->iwarp;
> > @@ -2696,6 +2696,7 @@ qed_iwarp_ll2_start(struct qed_hwfn *p_hwfn,
> >  	if (rc)
> >  		goto err;
> >  
> > +	rc = -ENOMEM;
> >  	iwarp_info->partial_fpdus = kcalloc((u16)p_hwfn->p_rdma_info->num_qps,
> >  					    sizeof(*iwarp_info->partial_fpdus),
> >  					    GFP_KERNEL);
> 
> Does the memory allocated here need to be freed when error happens below?
> 

Hm...  I think you're right that it leaks.  Also I'm confused by the
qed_iwarp_ll2_alloc_buffers() allocation.  The comment in there says
that /* buffers will be deallocated by qed_ll2 */ but qed_ll2 is not
a function name or something which is useful to grep.

regards,
dan carpenter