linux-kernel - Re: [PATCH] RDMA/hfi1: fix potential memory leak in setup_base

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Date:   Mon, 18 Jul 2022 13:39:53 +0300
From:   Leon Romanovsky <leon@...nel.org>
To:     Dennis Dalessandro <dennis.dalessandro@...nelisnetworks.com>
Cc:     Jianglei Nie <niejianglei2021@....com>, jgg@...pe.ca,
        linux-rdma@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] RDMA/hfi1: fix potential memory leak in setup_base_ctxt()

On Mon, Jul 11, 2022 at 07:52:25AM -0400, Dennis Dalessandro wrote:
> On 7/11/22 3:07 AM, Jianglei Nie wrote:
> > setup_base_ctxt() allocates a memory chunk for uctxt->groups with
> > hfi1_alloc_ctxt_rcv_groups(). When init_user_ctxt() fails, uctxt->groups
> > is not released, which will lead to a memory leak.
> > 
> > We should release the uctxt->groups with hfi1_free_ctxt_rcv_groups()
> > when init_user_ctxt() fails.
> > 
> > Signed-off-by: Jianglei Nie <niejianglei2021@....com>
> > ---
> >  drivers/infiniband/hw/hfi1/file_ops.c | 4 +++-
> >  1 file changed, 3 insertions(+), 1 deletion(-)
> > 
> > diff --git a/drivers/infiniband/hw/hfi1/file_ops.c b/drivers/infiniband/hw/hfi1/file_ops.c
> > index 2e4cf2b11653..629beff053ad 100644
> > --- a/drivers/infiniband/hw/hfi1/file_ops.c
> > +++ b/drivers/infiniband/hw/hfi1/file_ops.c
> > @@ -1179,8 +1179,10 @@ static int setup_base_ctxt(struct hfi1_filedata *fd,
> >  		goto done;
> >  
> >  	ret = init_user_ctxt(fd, uctxt);
> > -	if (ret)
> > +	if (ret) {
> > +		hfi1_free_ctxt_rcv_groups(uctxt);
> >  		goto done;
> > +	}
> >  
> >  	user_init(uctxt);
> >  
> 
> Doesn't seem like this patch is correct. The free is done when the file is
> closed, along with other clean up stuff. See hfi1_file_close().

Can setup_base_ctxt() be called twice for same uctxt?
You are allocating rcd->groups and not releasing.

Thanks

> 
> -Denny