linux-kernel - Re: [PATCH -next] IB/qib: Add missing err handle for qib_user_sdma_rb

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Message-ID: <20190102184050.GI5424@mtr-leonro.mtl.com>
Date:   Wed, 2 Jan 2019 20:40:50 +0200
From:   Leon Romanovsky <leon@...nel.org>
To:     Jason Gunthorpe <jgg@...pe.ca>
Cc:     YueHaibing <yuehaibing@...wei.com>, dennis.dalessandro@...el.com,
        mike.marciniszyn@...el.com, dledford@...hat.com,
        linux-kernel@...r.kernel.org, linux-rdma@...r.kernel.org
Subject: Re: [PATCH -next] IB/qib: Add missing err handle for
 qib_user_sdma_rb_insert

On Wed, Jan 02, 2019 at 10:12:24AM -0700, Jason Gunthorpe wrote:
> On Fri, Dec 21, 2018 at 10:19:38AM +0800, YueHaibing wrote:
> > It should goto err handle if qib_user_sdma_rb_insert fails,
> > other than success return.
> >
> > Fixes: 67810e8c3c01 ("RDMA/qib: Remove all occurrences of BUG_ON()")
> > Signed-off-by: YueHaibing <yuehaibing@...wei.com>
> > ---
> >  drivers/infiniband/hw/qib/qib_user_sdma.c | 2 ++
> >  1 file changed, 2 insertions(+)
> >
> > diff --git a/drivers/infiniband/hw/qib/qib_user_sdma.c b/drivers/infiniband/hw/qib/qib_user_sdma.c
> > index 31c523b..e87c0a7 100644
> > --- a/drivers/infiniband/hw/qib/qib_user_sdma.c
> > +++ b/drivers/infiniband/hw/qib/qib_user_sdma.c
> > @@ -237,6 +237,8 @@ qib_user_sdma_queue_create(struct device *dev, int unit, int ctxt, int sctxt)
> >
> >  		ret = qib_user_sdma_rb_insert(&qib_user_sdma_rb_root,
> >  					sdma_rb_node);
> > +		if (ret == 0)
> > +			goto err_rb;
> >  	}
>
> This doesn't look right, what about undoing the kmalloc directly
> above?

Back then, I came to conclusion that qib_user_sdma_rb_insert() never
returns 0. Otherwise, Dennis would see that BUG_ON() for a long time
ago.

Thanks

>
> Jason

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