[PATCH AUTOSEL 6.2 4/9] soundwire: qcom: gracefully handle too many ports in DT

Sasha Levin
2023-05-10T20:50:52Z

From: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>

[ Upstream commit 2367e0ecb498764e95cfda691ff0828f7d25f9a4 ]

There are two issues related to the number of ports coming from
Devicetree when exceeding in total QCOM_SDW_MAX_PORTS. Both lead to
incorrect memory accesses:
1. With DTS having too big value of input or output ports, the driver,
when copying port parameters from local/stack arrays into 'pconfig'
array in 'struct qcom_swrm_ctrl', will iterate over their sizes.

2. If DTS also has too many parameters for these ports (e.g.
qcom,ports-sinterval-low), the driver will overflow buffers on the
stack when reading these properties from DTS.

Add a sanity check so incorrect DTS will not cause kernel memory
corruption.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Link: https://lore.kernel.org/r/20230222144412.237832-2-krzysztof.kozlowski@linaro.org
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/soundwire/qcom.c | 3 +++
1 file changed, 3 insertions(+)

diff --git a/drivers/soundwire/qcom.c b/drivers/soundwire/qcom.c
index 3354248702900..3e80a4d388cbb 100644
--- a/drivers/soundwire/qcom.c
+++ b/drivers/soundwire/qcom.c
@@ -1217,6 +1217,9 @@ static int qcom_swrm_get_port_config(struct qcom_swrm_ctrl *ctrl)
ctrl->num_dout_ports = val;

nports = ctrl->num_dout_ports + ctrl->num_din_ports;
+ if (nports > QCOM_SDW_MAX_PORTS)
+ return -EINVAL;
+
/* Valid port numbers are from 1-14, so mask out port 0 explicitly */
set_bit(0, &ctrl->dout_port_mask);
set_bit(0, &ctrl->din_port_mask);
--
2.39.2