linux-kernel - Re: [PATCH][next] RDMA/hns: fix potential integer overflow on left shift

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Date:   Tue, 25 Jun 2019 13:19:15 +0000
From:   Jason Gunthorpe <jgg@...lanox.com>
To:     Colin King <colin.king@...onical.com>
CC:     Lijun Ou <oulijun@...wei.com>, Wei Hu <xavier.huwei@...wei.com>,
        Doug Ledford <dledford@...hat.com>,
        "linux-rdma@...r.kernel.org" <linux-rdma@...r.kernel.org>,
        "kernel-janitors@...r.kernel.org" <kernel-janitors@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH][next] RDMA/hns: fix potential integer overflow on left
 shift

On Mon, Jun 24, 2019 at 10:46:08PM +0100, Colin King wrote:
> From: Colin Ian King <colin.king@...onical.com>
> 
> There is a potential integer overflow when int i is left shifted
> as this is evaluated using 32 bit arithmetic but is being used in
> a context that expects an expression of type dma_addr_t.  Fix this
> by casting integer i to dma_addr_t before shifting to avoid the
> overflow.
> 
> Addresses-Coverity: ("Unintentional integer overflow")
> Fixes: 2ac0bc5e725e ("RDMA/hns: Add a group interfaces for optimizing buffers getting flow")
> Signed-off-by: Colin Ian King <colin.king@...onical.com>
> ---
>  drivers/infiniband/hw/hns/hns_roce_alloc.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)

Applied to for-next, thanks

Jason