linux-kernel - RE: [PATCH] HID: intel_ish-hid: Add check for ishtp_dma_tx

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Date:   Wed, 21 Dec 2022 08:02:49 +0000
From:   "Xu, Even" <even.xu@...el.com>
To:     srinivas pandruvada <srinivas.pandruvada@...ux.intel.com>,
        Jiasheng Jiang <jiasheng@...as.ac.cn>,
        "jikos@...nel.org" <jikos@...nel.org>,
        "benjamin.tissoires@...hat.com" <benjamin.tissoires@...hat.com>
CC:     "linux-input@...r.kernel.org" <linux-input@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH] HID: intel_ish-hid: Add check for ishtp_dma_tx_map

Yes, Srinivas, agree with you, the error handling should be added during allocation.
Will submit the patch for it.

Thanks!

Best Regards,
Even Xu

-----Original Message-----
From: srinivas pandruvada <srinivas.pandruvada@...ux.intel.com> 
Sent: Wednesday, December 21, 2022 1:08 AM
To: Jiasheng Jiang <jiasheng@...as.ac.cn>; jikos@...nel.org; benjamin.tissoires@...hat.com; Xu, Even <even.xu@...el.com>
Cc: linux-input@...r.kernel.org; linux-kernel@...r.kernel.org
Subject: Re: [PATCH] HID: intel_ish-hid: Add check for ishtp_dma_tx_map

On Tue, 2022-11-22 at 21:48 +0800, Jiasheng Jiang wrote:
> As the kcalloc may return NULL pointer, it should be better to check 
> the ishtp_dma_tx_map before use in order to avoid NULL pointer 
> dereference.
> 
> Fixes: 3703f53b99e4 ("HID: intel_ish-hid: ISH Transport layer")
> Signed-off-by: Jiasheng Jiang <jiasheng@...as.ac.cn>
Acked-by: Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>
> ---
+Even Xu, We should do during alloc. Please try to submit a change for
that for later kernel rev as it will require error processing during hbm dispatch.

>  drivers/hid/intel-ish-hid/ishtp/dma-if.c | 10 ++++++++++
>  1 file changed, 10 insertions(+)
> 
> diff --git a/drivers/hid/intel-ish-hid/ishtp/dma-if.c
> b/drivers/hid/intel-ish-hid/ishtp/dma-if.c
> index 40554c8daca0..00046cbfd4ed 100644
> --- a/drivers/hid/intel-ish-hid/ishtp/dma-if.c
> +++ b/drivers/hid/intel-ish-hid/ishtp/dma-if.c
> @@ -104,6 +104,11 @@ void *ishtp_cl_get_dma_send_buf(struct 
> ishtp_device *dev,
>         int required_slots = (size / DMA_SLOT_SIZE)
>                 + 1 * (size % DMA_SLOT_SIZE != 0);
>  
> +       if (!dev->ishtp_dma_tx_map) {
> +               dev_err(dev->devc, "Fail to allocate Tx map\n");
> +               return NULL;
> +       }
> +
>         spin_lock_irqsave(&dev->ishtp_dma_tx_lock, flags);
>         for (i = 0; i <= (dev->ishtp_dma_num_slots - required_slots);
> i++) {
>                 free = 1;
> @@ -150,6 +155,11 @@ void ishtp_cl_release_dma_acked_mem(struct
> ishtp_device *dev,
>                 return;
>         }
>  
> +       if (!dev->ishtp_dma_tx_map) {
> +               dev_err(dev->devc, "Fail to allocate Tx map\n");
> +               return;
> +       }
> +
>         i = (msg_addr - dev->ishtp_host_dma_tx_buf) / DMA_SLOT_SIZE;
>         spin_lock_irqsave(&dev->ishtp_dma_tx_lock, flags);
>         for (j = 0; j < acked_slots; j++) {