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([178.197.216.144]) by smtp.gmail.com with ESMTPSA id o10-20020a1c750a000000b003e7c89b3514sm5059776wmc.23.2023.02.22.06.44.16 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 22 Feb 2023 06:44:16 -0800 (PST) From: Krzysztof Kozlowski To: Andy Gross , Bjorn Andersson , Konrad Dybcio , Vinod Koul , Bard Liao , Pierre-Louis Bossart , Sanyog Kale , linux-arm-msm@vger.kernel.org, alsa-devel@alsa-project.org, linux-kernel@vger.kernel.org Subject: [PATCH 2/2] soundwire: qcom: gracefully handle too many ports in DT Date: Wed, 22 Feb 2023 15:44:12 +0100 Message-Id: <20230222144412.237832-2-krzysztof.kozlowski@linaro.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230222144412.237832-1-krzysztof.kozlowski@linaro.org> References: <20230222144412.237832-1-krzysztof.kozlowski@linaro.org> MIME-Version: 1.0 Message-ID-Hash: Y5AXB3VKNRKM5ZNUVQNTF4YUSXIDP5DG X-Message-ID-Hash: Y5AXB3VKNRKM5ZNUVQNTF4YUSXIDP5DG X-MailFrom: krzysztof.kozlowski@linaro.org X-Mailman-Rule-Misses: dmarc-mitigation; no-senders; approved; emergency; loop; banned-address; member-moderation; header-match-alsa-devel.alsa-project.org-0; header-match-alsa-devel.alsa-project.org-1; nonmember-moderation; administrivia; implicit-dest; max-recipients; max-size; news-moderation; no-subject; digests; suspicious-header CC: Krzysztof Kozlowski X-Mailman-Version: 3.3.8 Precedence: list List-Id: "Alsa-devel mailing list for ALSA developers - http://www.alsa-project.org" Archived-At: List-Archive: List-Help: List-Owner: List-Post: List-Subscribe: List-Unsubscribe: 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 --- drivers/soundwire/qcom.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/soundwire/qcom.c b/drivers/soundwire/qcom.c index 79bebcecde6d..c296e0bf897b 100644 --- a/drivers/soundwire/qcom.c +++ b/drivers/soundwire/qcom.c @@ -1218,6 +1218,9 @@ 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);