[v4,6/6] bus: mhi: core: Add range checks for BHI and BHIe

Message ID 1620330705-40192-7-git-send-email-bbhatt@codeaurora.org
State New
Headers show
Series
  • BHI/BHIe improvements for MHI power purposes
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Commit Message

Bhaumik Bhatt May 6, 2021, 7:51 p.m.
When obtaining the BHI or BHIe offsets during the power up
preparation phase, range checks are missing. These can help
controller drivers avoid accessing any address outside of the
MMIO region. Ensure that mhi_cntrl->reg_len is set before MHI
registration as it is a required field and range checks will
fail without it.

Signed-off-by: Bhaumik Bhatt <bbhatt@codeaurora.org>
Reviewed-by: Jeffrey Hugo <quic_jhugo@quicinc.com>
---
 drivers/bus/mhi/core/init.c | 18 +++++++++++++++++-
 1 file changed, 17 insertions(+), 1 deletion(-)

Comments

Hemant Kumar May 7, 2021, 2:33 a.m. | #1
On 5/6/21 12:51 PM, Bhaumik Bhatt wrote:
> When obtaining the BHI or BHIe offsets during the power up
> preparation phase, range checks are missing. These can help
> controller drivers avoid accessing any address outside of the
> MMIO region. Ensure that mhi_cntrl->reg_len is set before MHI
> registration as it is a required field and range checks will
> fail without it.
> 
> Signed-off-by: Bhaumik Bhatt <bbhatt@codeaurora.org>
> Reviewed-by: Jeffrey Hugo <quic_jhugo@quicinc.com>

Reviewed-by: Hemant Kumar <hemantk@codeaurora.org>
Manivannan Sadhasivam May 21, 2021, 1:54 p.m. | #2
On Thu, May 06, 2021 at 12:51:45PM -0700, Bhaumik Bhatt wrote:
> When obtaining the BHI or BHIe offsets during the power up
> preparation phase, range checks are missing. These can help
> controller drivers avoid accessing any address outside of the
> MMIO region. Ensure that mhi_cntrl->reg_len is set before MHI
> registration as it is a required field and range checks will
> fail without it.
> 
> Signed-off-by: Bhaumik Bhatt <bbhatt@codeaurora.org>
> Reviewed-by: Jeffrey Hugo <quic_jhugo@quicinc.com>

Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>

Thanks,
Mani

> ---
>  drivers/bus/mhi/core/init.c | 18 +++++++++++++++++-
>  1 file changed, 17 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/bus/mhi/core/init.c b/drivers/bus/mhi/core/init.c
> index 1cc2f22..aeb1e3c 100644
> --- a/drivers/bus/mhi/core/init.c
> +++ b/drivers/bus/mhi/core/init.c
> @@ -885,7 +885,8 @@ int mhi_register_controller(struct mhi_controller *mhi_cntrl,
>  	if (!mhi_cntrl || !mhi_cntrl->cntrl_dev || !mhi_cntrl->regs ||
>  	    !mhi_cntrl->runtime_get || !mhi_cntrl->runtime_put ||
>  	    !mhi_cntrl->status_cb || !mhi_cntrl->read_reg ||
> -	    !mhi_cntrl->write_reg || !mhi_cntrl->nr_irqs || !mhi_cntrl->irq)
> +	    !mhi_cntrl->write_reg || !mhi_cntrl->nr_irqs ||
> +	    !mhi_cntrl->irq || !mhi_cntrl->reg_len)
>  		return -EINVAL;
>  
>  	ret = parse_config(mhi_cntrl, config);
> @@ -1077,6 +1078,13 @@ int mhi_prepare_for_power_up(struct mhi_controller *mhi_cntrl)
>  		dev_err(dev, "Error getting BHI offset\n");
>  		goto error_reg_offset;
>  	}
> +
> +	if (bhi_off >= mhi_cntrl->reg_len) {
> +		dev_err(dev, "BHI offset: 0x%x is out of range: 0x%zx\n",
> +			bhi_off, mhi_cntrl->reg_len);
> +		ret = -EINVAL;
> +		goto error_reg_offset;
> +	}
>  	mhi_cntrl->bhi = mhi_cntrl->regs + bhi_off;
>  
>  	if (mhi_cntrl->fbc_download || mhi_cntrl->rddm_size) {
> @@ -1086,6 +1094,14 @@ int mhi_prepare_for_power_up(struct mhi_controller *mhi_cntrl)
>  			dev_err(dev, "Error getting BHIE offset\n");
>  			goto error_reg_offset;
>  		}
> +
> +		if (bhie_off >= mhi_cntrl->reg_len) {
> +			dev_err(dev,
> +				"BHIe offset: 0x%x is out of range: 0x%zx\n",
> +				bhie_off, mhi_cntrl->reg_len);
> +			ret = -EINVAL;
> +			goto error_reg_offset;
> +		}
>  		mhi_cntrl->bhie = mhi_cntrl->regs + bhie_off;
>  	}
>  
> -- 
> The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
> a Linux Foundation Collaborative Project
>

Patch

diff --git a/drivers/bus/mhi/core/init.c b/drivers/bus/mhi/core/init.c
index 1cc2f22..aeb1e3c 100644
--- a/drivers/bus/mhi/core/init.c
+++ b/drivers/bus/mhi/core/init.c
@@ -885,7 +885,8 @@  int mhi_register_controller(struct mhi_controller *mhi_cntrl,
 	if (!mhi_cntrl || !mhi_cntrl->cntrl_dev || !mhi_cntrl->regs ||
 	    !mhi_cntrl->runtime_get || !mhi_cntrl->runtime_put ||
 	    !mhi_cntrl->status_cb || !mhi_cntrl->read_reg ||
-	    !mhi_cntrl->write_reg || !mhi_cntrl->nr_irqs || !mhi_cntrl->irq)
+	    !mhi_cntrl->write_reg || !mhi_cntrl->nr_irqs ||
+	    !mhi_cntrl->irq || !mhi_cntrl->reg_len)
 		return -EINVAL;
 
 	ret = parse_config(mhi_cntrl, config);
@@ -1077,6 +1078,13 @@  int mhi_prepare_for_power_up(struct mhi_controller *mhi_cntrl)
 		dev_err(dev, "Error getting BHI offset\n");
 		goto error_reg_offset;
 	}
+
+	if (bhi_off >= mhi_cntrl->reg_len) {
+		dev_err(dev, "BHI offset: 0x%x is out of range: 0x%zx\n",
+			bhi_off, mhi_cntrl->reg_len);
+		ret = -EINVAL;
+		goto error_reg_offset;
+	}
 	mhi_cntrl->bhi = mhi_cntrl->regs + bhi_off;
 
 	if (mhi_cntrl->fbc_download || mhi_cntrl->rddm_size) {
@@ -1086,6 +1094,14 @@  int mhi_prepare_for_power_up(struct mhi_controller *mhi_cntrl)
 			dev_err(dev, "Error getting BHIE offset\n");
 			goto error_reg_offset;
 		}
+
+		if (bhie_off >= mhi_cntrl->reg_len) {
+			dev_err(dev,
+				"BHIe offset: 0x%x is out of range: 0x%zx\n",
+				bhie_off, mhi_cntrl->reg_len);
+			ret = -EINVAL;
+			goto error_reg_offset;
+		}
 		mhi_cntrl->bhie = mhi_cntrl->regs + bhie_off;
 	}