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

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Date:   Thu, 7 Jan 2021 16:41:02 -0400
From:   Jason Gunthorpe <jgg@...dia.com>
To:     <trix@...hat.com>
CC:     <selvin.xavier@...adcom.com>, <devesh.sharma@...adcom.com>,
        <dledford@...hat.com>, <leon@...nel.org>, <maxg@...lanox.com>,
        <galpress@...zon.com>, <michaelgur@...dia.com>,
        <monis@...lanox.com>, <gustavoars@...nel.org>,
        <linux-rdma@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] RDMA/ocrdma: fix use after free in
 ocrdma_dealloc_ucontext_pd()

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?

Thanks,
Jason