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@xxxxxxxxxxxxxx>
> Reviewed-by: Jeffrey Hugo <quic_jhugo@xxxxxxxxxxx>
Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@xxxxxxxxxx>
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
>
