linux-kernel - [PATCH v1] media: camss: vfe: Don't use vfe->base before it's assigned

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Date:   Tue, 10 Aug 2021 12:33:36 +0200
From:   Robert Foss <robert.foss@...aro.org>
To:     robert.foss@...aro.org, todor.too@...il.com, agross@...nel.org,
        bjorn.andersson@...aro.org, mchehab@...nel.org,
        hverkuil-cisco@...all.nl, linux-media@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
        Naresh Kamboju <naresh.kamboju@...aro.org>,
        Hans Verkuil <hverkuil@...all.nl>
Cc:     Linux Kernel Functional Testing <lkft@...aro.org>
Subject: [PATCH v1] media: camss: vfe: Don't use vfe->base before it's assigned

vfe->ops->hw_version(vfe) being called before vfe->base has been assigned
is incorrect and causes crashes.

Fixes: b10b5334528a9 ("media: camss: vfe: Don't read hardware version needlessly")

Reported-by: Linux Kernel Functional Testing <lkft@...aro.org>
Signed-off-by: Robert Foss <robert.foss@...aro.org>
---
 drivers/media/platform/qcom/camss/camss-vfe.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/media/platform/qcom/camss/camss-vfe.c b/drivers/media/platform/qcom/camss/camss-vfe.c
index 6b2f33fc9be22..1c8d2f0f81207 100644
--- a/drivers/media/platform/qcom/camss/camss-vfe.c
+++ b/drivers/media/platform/qcom/camss/camss-vfe.c
@@ -1299,7 +1299,6 @@ int msm_vfe_subdev_init(struct camss *camss, struct vfe_device *vfe,
 		return -EINVAL;
 	}
 	vfe->ops->subdev_init(dev, vfe);
-	vfe->ops->hw_version(vfe);
 
 	/* Memory */
 
@@ -1309,6 +1308,8 @@ int msm_vfe_subdev_init(struct camss *camss, struct vfe_device *vfe,
 		return PTR_ERR(vfe->base);
 	}
 
+	vfe->ops->hw_version(vfe);
+
 	/* Interrupt */
 
 	r = platform_get_resource_byname(pdev, IORESOURCE_IRQ,
-- 
2.30.2