linux-kernel - [PATCH -next 1/3] remoteproc: qcom: wcss: check return value after calling platform_get_resource

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Date:   Fri, 26 Aug 2022 09:45:09 +0800
From:   Yang Yingliang <yangyingliang@...wei.com>
To:     <linux-kernel@...r.kernel.org>, <linux-remoteproc@...r.kernel.org>
CC:     <agross@...nel.org>, <bjorn.andersson@...aro.org>
Subject: [PATCH -next 1/3] remoteproc: qcom: wcss: check return value after calling platform_get_resource_byname()

If platform_get_resource_byname() fails, 'res' will be set to null pointer,
it will cause null-ptr-deref when it used in devm_ioremap(), so we need check
the return value.

Fixes: 0af65b9b915e ("remoteproc: qcom: wcss: Add non pas wcss Q6 support for QCS404")
Signed-off-by: Yang Yingliang <yangyingliang@...wei.com>
---
 drivers/remoteproc/qcom_q6v5_wcss.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/remoteproc/qcom_q6v5_wcss.c b/drivers/remoteproc/qcom_q6v5_wcss.c
index bb0947f7770e..017ee225dc32 100644
--- a/drivers/remoteproc/qcom_q6v5_wcss.c
+++ b/drivers/remoteproc/qcom_q6v5_wcss.c
@@ -827,6 +827,8 @@ static int q6v5_wcss_init_mmio(struct q6v5_wcss *wcss,
 	int ret;
 
 	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "qdsp6");
+	if (!res)
+		return -EINVAL;
 	wcss->reg_base = devm_ioremap(&pdev->dev, res->start,
 				      resource_size(res));
 	if (!wcss->reg_base)
-- 
2.25.1