[media] VPU: mediatek: fix null pointer dereference on pdev

pdev is being null checked, however, prior to that it is being
dereferenced by platform_get_drvdata.  Move the assignments of
vpu and run to after the pdev null check to avoid a potential
null pointer dereference.

Signed-off-by: Colin Ian King <colin.king@canonical.com>
Reviewed-by: Tiffany Lin <tiffany.lin@mediatek.com>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

diff --git a/drivers/media/platform/mtk-vpu/mtk_vpu.c b/drivers/media/platform/mtk-vpu/mtk_vpu.c
index 63510de0147c5702258ff6944b2d1ac6b82a66ef..c3643d9291670894702c5967a4554513a82f92b8 100644 (file)
--- a/drivers/media/platform/mtk-vpu/mtk_vpu.c
+++ b/drivers/media/platform/mtk-vpu/mtk_vpu.c
@@ -534,9 +534,9 @@ static int load_requested_vpu(struct mtk_vpu *vpu,
 
 int vpu_load_firmware(struct platform_device *pdev)
 {
-       struct mtk_vpu *vpu = platform_get_drvdata(pdev);
+       struct mtk_vpu *vpu;
        struct device *dev = &pdev->dev;
-       struct vpu_run *run = &vpu->run;
+       struct vpu_run *run;
        const struct firmware *vpu_fw = NULL;
        int ret;
 
@@ -545,6 +545,9 @@ int vpu_load_firmware(struct platform_device *pdev)
                return -EINVAL;
        }
 
+       vpu = platform_get_drvdata(pdev);
+       run = &vpu->run;
+
        mutex_lock(&vpu->vpu_mutex);
        if (vpu->fw_loaded) {
                mutex_unlock(&vpu->vpu_mutex);