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From: Manivannan Sadhasivam <mani@kernel.org>
To: Dan Carpenter <error27@gmail.com>
Cc: Manivannan Sadhasivam <mani@kernel.org>,
	Alex Elder <elder@linaro.org>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Jeffrey Hugo <quic_jhugo@quicinc.com>,
	mhi@lists.linux.dev, linux-arm-msm@vger.kernel.org,
	kernel-janitors@vger.kernel.org
Subject: Re: [PATCH] bus: mhi: ep: Fix off by one in mhi_ep_process_cmd_ring()
Date: Fri, 27 Jan 2023 12:29:58 +0530	[thread overview]
Message-ID: <20230127065958.GG7809@thinkpad> (raw)
In-Reply-To: <Y9JH5sudiZWvbODv@kili>

On Thu, Jan 26, 2023 at 12:29:10PM +0300, Dan Carpenter wrote:
> The > comparison should be changed to >= to prevent an out of bounds
> access into the mhi_cntrl->mhi_chan[] array.  The mhi_cntrl->mhi_chan[]
> array is allocated in mhi_ep_chan_init() and has mhi_cntrl->max_chan
> elements.
> 
> Fixes: 2527ad44ddb2 ("bus: mhi: ep: Check if the channel is supported by the controller")
> Signed-off-by: Dan Carpenter <error27@gmail.com>

Applied to mhi-next!

Thanks,
Mani

> ---
>  drivers/bus/mhi/ep/main.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/bus/mhi/ep/main.c b/drivers/bus/mhi/ep/main.c
> index bcaaba97ef63..be2d56e7f392 100644
> --- a/drivers/bus/mhi/ep/main.c
> +++ b/drivers/bus/mhi/ep/main.c
> @@ -125,7 +125,7 @@ static int mhi_ep_process_cmd_ring(struct mhi_ep_ring *ring, struct mhi_ring_ele
>  	ch_id = MHI_TRE_GET_CMD_CHID(el);
>  
>  	/* Check if the channel is supported by the controller */
> -	if ((ch_id > mhi_cntrl->max_chan) || !mhi_cntrl->mhi_chan[ch_id].name) {
> +	if ((ch_id >= mhi_cntrl->max_chan) || !mhi_cntrl->mhi_chan[ch_id].name) {
>  		dev_err(dev, "Channel (%u) not supported!\n", ch_id);
>  		return -ENODEV;
>  	}
> -- 
> 2.35.1
> 

-- 
மணிவண்ணன் சதாசிவம்

      parent reply	other threads:[~2023-01-27  7:00 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-01-26  9:29 [PATCH] bus: mhi: ep: Fix off by one in mhi_ep_process_cmd_ring() Dan Carpenter
2023-01-26 13:26 ` Alex Elder
2023-01-27  6:48   ` Manivannan Sadhasivam
2023-01-27  6:46 ` Manivannan Sadhasivam
2023-01-27  6:59 ` Manivannan Sadhasivam [this message]

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