From: Bhaumik Bhatt <bbhatt@xxxxxxxxxxxxxx> 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: Hemant Kumar <hemantk@xxxxxxxxxxxxxx> Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@xxxxxxxxxx> Link: https://lore.kernel.org/r/1620330705-40192-7-git-send-email-bbhatt@xxxxxxxxxxxxxx Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@xxxxxxxxxx> --- 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 1cc2f225d3d1..aeb1e3c2cdc4 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; } -- 2.25.1
