linux-kernel - Re: [PATCH] RDMA/ocrdma: fix use after free in ocrdma_dealloc_ucontext

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Message-ID: <CA+sbYW1_zYv47YV8Btd8+JW=3QcSo4N1yFFDycnTS853UHGGag@mail.gmail.com>
Date:   Mon, 11 Jan 2021 23:39:34 +0530
From:   Selvin Xavier <selvin.xavier@...adcom.com>
To:     Tom Rix <trix@...hat.com>
Cc:     Jason Gunthorpe <jgg@...dia.com>,
        Devesh Sharma <devesh.sharma@...adcom.com>,
        Doug Ledford <dledford@...hat.com>,
        Leon Romanovsky <leon@...nel.org>, maxg@...lanox.com,
        Gal Pressman <galpress@...zon.com>, michaelgur@...dia.com,
        Moni Shoua <monis@...lanox.com>, gustavoars@...nel.org,
        linux-rdma@...r.kernel.org,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] RDMA/ocrdma: fix use after free in ocrdma_dealloc_ucontext_pd()

On Fri, Jan 8, 2021 at 3:13 AM Tom Rix <trix@...hat.com> wrote:
>
>
> On 1/7/21 12:41 PM, Jason Gunthorpe wrote:
> > On Tue, Dec 29, 2020 at 06:46:53PM -0800, trix@...hat.com wrote:
> >> From: Tom Rix <trix@...hat.com>
> >>
> >> In ocrdma_dealloc_ucontext_pd() uctx->cntxt_pd is assigned to
> >> the variable pd and then after uctx->cntxt_pd is freed, the
> >> variable pd is passed to function _ocrdma_dealloc_pd() which
> >> dereferences pd directly or through its call to
> >> ocrdma_mbx_dealloc_pd().
> >>
> >> Reorder the free using the variable pd.
> >>
> >> Fixes: 21a428a019c9 ("RDMA: Handle PD allocations by IB/core")
> >> Signed-off-by: Tom Rix <trix@...hat.com>
> >>  drivers/infiniband/hw/ocrdma/ocrdma_verbs.c | 2 +-
> >>  1 file changed, 1 insertion(+), 1 deletion(-)
> > Applied to for-rc
> >
> > Is anyone testing ocrdma? Just doing the pyverbs rdma tests with kasn
> > turned on would have instantly caught this, and the change is nearly a
> > year old.
> >
> > Is ocrdma obsolete enough we can delete the driver?

Broadcom is not doing any active development/testing  with ocrdma now.
I am checking with other teams to see if this can be deleted
completely. Will get back asap.

Thanks,
Selvin

>
> I am not an authority on ocrdma, i am fixing treewide, the problems clang static analysis flags.
>
> Tom
>
> >
> > Thanks,
> > Jason
> >
>

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