linux-kernel - [PATCH 1/1] soc: qcom: geni: Provide parameter error checking

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Date:   Tue,  3 Sep 2019 14:50:52 +0100
From:   Lee Jones <lee.jones@...aro.org>
To:     agross@...nel.org
Cc:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, bjorn.andersson@...aro.org,
        Lee Jones <lee.jones@...aro.org>
Subject: [PATCH 1/1] soc: qcom: geni: Provide parameter error checking

When booting with ACPI, the Geni Serial Engine is not set as the I2C/SPI
parent and thus, the wrapper (parent device) is unassigned.  This causes
the kernel to crash with a null dereference error.

Fixes: 8bc529b25354 ("soc: qcom: geni: Add support for ACPI")
Signed-off-by: Lee Jones <lee.jones@...aro.org>
---
Since we are already at -rc7 this patch should be processed ASAP - thank you.

drivers/soc/qcom/qcom-geni-se.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/soc/qcom/qcom-geni-se.c b/drivers/soc/qcom/qcom-geni-se.c
index d5cf953b4337..7d622ea1274e 100644
--- a/drivers/soc/qcom/qcom-geni-se.c
+++ b/drivers/soc/qcom/qcom-geni-se.c
@@ -630,6 +630,9 @@ int geni_se_tx_dma_prep(struct geni_se *se, void *buf, size_t len,
 	struct geni_wrapper *wrapper = se->wrapper;
 	u32 val;
 
+	if (!wrapper)
+		return -EINVAL;
+
 	*iova = dma_map_single(wrapper->dev, buf, len, DMA_TO_DEVICE);
 	if (dma_mapping_error(wrapper->dev, *iova))
 		return -EIO;
@@ -663,6 +666,9 @@ int geni_se_rx_dma_prep(struct geni_se *se, void *buf, size_t len,
 	struct geni_wrapper *wrapper = se->wrapper;
 	u32 val;
 
+	if (!wrapper)
+		return -EINVAL;
+
 	*iova = dma_map_single(wrapper->dev, buf, len, DMA_FROM_DEVICE);
 	if (dma_mapping_error(wrapper->dev, *iova))
 		return -EIO;
-- 
2.17.1