| Message ID | 1620234501-30461-7-git-send-email-bbhatt@codeaurora.org |
|---|---|
| State | Superseded |
| Headers | show |
| Series | [v3,1/6] bus: mhi: core: Set BHI/BHIe offsets on power up preparation | expand |
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
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"); + 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"); + ret = -EINVAL; + goto error_reg_offset; + } mhi_cntrl->bhie = mhi_cntrl->regs + bhie_off; }