[PATCH] remoteproc: qcom: q6v5: Fix potential null-ptr-deref in q6v5_wcss_init_mmio()

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q6v5_wcss_init_mmio() will call platform_get_resource_byname() that may
fail and return NULL. devm_ioremap() will use res->start as input, which
may causes null-ptr-deref. Check the ret value of
platform_get_resource_byname() to avoid the null-ptr-deref.

Fixes: 0af65b9b915e ("remoteproc: qcom: wcss: Add non pas wcss Q6 support for QCS404")
Signed-off-by: Shang XiaoJing <shangxiaojing@xxxxxxxxxx>
---
 drivers/remoteproc/qcom_q6v5_wcss.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/remoteproc/qcom_q6v5_wcss.c b/drivers/remoteproc/qcom_q6v5_wcss.c
index bb0947f7770e..de232337e082 100644
--- a/drivers/remoteproc/qcom_q6v5_wcss.c
+++ b/drivers/remoteproc/qcom_q6v5_wcss.c
@@ -827,6 +827,9 @@ 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)
-- 
2.17.1




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