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SubjectRe: [PATCH v3 6/6] bus: mhi: core: Add range checks for BHI and BHIe
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Hi Bhaumik,

On 5/5/21 10:08 AM, 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>
> ---
> drivers/bus/mhi/core/init.c | 15 ++++++++++++++-
> 1 file changed, 14 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/bus/mhi/core/init.c b/drivers/bus/mhi/core/init.c
> index 1cc2f22..86ad06e 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 +1078,12 @@ 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 is out of range\n");
Does is make sense to also log bhi_off and/or reg_len values in error if
it helps in debugging
> + 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 +1093,12 @@ 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 is out of range\n");
Same comment as above
> + ret = -EINVAL;
> + goto error_reg_offset;
> + }
> mhi_cntrl->bhie = mhi_cntrl->regs + bhie_off;
> }
>
>

Thanks,
Hemant
--
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project

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