linux-kernel - RE: [EXT] [PATCH] RDMA/qedr: fix potential use after free

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Message-ID: <MN2PR18MB3182E3D4E7FD120FA1F6248BA1790@MN2PR18MB3182.namprd18.prod.outlook.com>
Date:   Wed, 6 Nov 2019 08:48:16 +0000
From:   Michal Kalderon <mkalderon@...vell.com>
To:     Pan Bian <bianpan2016@....com>, Ariel Elior <aelior@...vell.com>,
        "Doug Ledford" <dledford@...hat.com>,
        Jason Gunthorpe <jgg@...pe.ca>
CC:     "linux-rdma@...r.kernel.org" <linux-rdma@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [EXT] [PATCH] RDMA/qedr: fix potential use after free

> From: Pan Bian <bianpan2016@....com>
> Sent: Wednesday, November 6, 2019 8:24 AM
> 
> External Email
> 
> ----------------------------------------------------------------------
> Move the release operation after error log to avoid possible use after free.
> 
> Signed-off-by: Pan Bian <bianpan2016@....com>
> ---
>  drivers/infiniband/hw/qedr/qedr_iw_cm.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/infiniband/hw/qedr/qedr_iw_cm.c
> b/drivers/infiniband/hw/qedr/qedr_iw_cm.c
> index 22881d4442b9..eedc32b72ff2 100644
> --- a/drivers/infiniband/hw/qedr/qedr_iw_cm.c
> +++ b/drivers/infiniband/hw/qedr/qedr_iw_cm.c
> @@ -451,10 +451,10 @@ qedr_addr6_resolve(struct qedr_dev *dev,
> 
>  	if ((!dst) || dst->error) {
>  		if (dst) {
> -			dst_release(dst);
>  			DP_ERR(dev,
>  			       "ip6_route_output returned dst->error = %d\n",
>  			       dst->error);
> +			dst_release(dst);
>  		}
>  		return -EINVAL;
>  	}
> --
> 2.7.4

Thanks, 

Acked-by: Michal Kalderon <michal.kalderon@...vell.com>