linux-kernel - Re: [PATCH] ocrdma: Fix potential null-ptr-deref in ocrdma_is_qp_in_rq

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Date:   Wed, 15 Feb 2023 14:28:13 +0200
From:   Leon Romanovsky <leon@...nel.org>
To:     Natalia Petrova <n.petrova@...tech.ru>
Cc:     Jason Gunthorpe <jgg@...pe.ca>, linux-rdma@...r.kernel.org,
        linux-kernel@...r.kernel.org, lvc-project@...uxtesting.org
Subject: Re: [PATCH] ocrdma: Fix potential null-ptr-deref in
 ocrdma_is_qp_in_rq_flushlist()

On Wed, Feb 15, 2023 at 01:10:45PM +0300, Natalia Petrova wrote:
> The 'qp->rq_cq' pointer can be equal to null in ocrdma_destroy_qp()

How is it possible that we will have valid QP without rq_cq?

Thanks

> function. That's why 'qp->rq_cq' should be checked for null in
> ocrdma_del_flush_qp() before it will be dereferenced in
> ocrdma_is_qp_in_rq_flushlist().
> 
> Found by Linux Verification Center (linuxtesting.org) with SVACE.
> 
> Fixes: fe2caefcdf58 ("RDMA/ocrdma: Add driver for Emulex OneConnect IBoE RDMA adapter")
> Signed-off-by: Natalia Petrova <n.petrova@...tech.ru>
> ---
>  drivers/infiniband/hw/ocrdma/ocrdma_verbs.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/infiniband/hw/ocrdma/ocrdma_verbs.c b/drivers/infiniband/hw/ocrdma/ocrdma_verbs.c
> index dd4021b11963..a3d994ee178c 100644
> --- a/drivers/infiniband/hw/ocrdma/ocrdma_verbs.c
> +++ b/drivers/infiniband/hw/ocrdma/ocrdma_verbs.c
> @@ -1660,7 +1660,7 @@ void ocrdma_del_flush_qp(struct ocrdma_qp *qp)
>  	found = ocrdma_is_qp_in_sq_flushlist(qp->sq_cq, qp);
>  	if (found)
>  		list_del(&qp->sq_entry);
> -	if (!qp->srq) {
> +	if (!qp->srq && qp->rq_cq) {
>  		found = ocrdma_is_qp_in_rq_flushlist(qp->rq_cq, qp);
>  		if (found)
>  			list_del(&qp->rq_entry);
> -- 
> 2.34.1
>