linux-kernel - [PATCH AUTOSEL 6.3 4/9] soundwire: qcom: gracefully handle too many ports in DT

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Message-Id: <20230510204905.104628-4-sashal@kernel.org>
Date:   Wed, 10 May 2023 16:49:00 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Vinod Koul <vkoul@...nel.org>, Sasha Levin <sashal@...nel.org>,
        agross@...nel.org, andersson@...nel.org,
        yung-chuan.liao@...ux.intel.com, linux-arm-msm@...r.kernel.org,
        alsa-devel@...a-project.org
Subject: [PATCH AUTOSEL 6.3 4/9] soundwire: qcom: gracefully handle too many ports in DT

From: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.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@...aro.org>
Reviewed-by: Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
Reviewed-by: Konrad Dybcio <konrad.dybcio@...aro.org>
Link: https://lore.kernel.org/r/20230222144412.237832-2-krzysztof.kozlowski@linaro.org
Signed-off-by: Vinod Koul <vkoul@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.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