Messages in this thread Patch in this message | | | Subject | Re: [PATCH] [media] VPU: mediatek: fix dereference of pdev before checking it is null | From | andrew-ct chen <> | Date | Mon, 21 Nov 2016 19:16:29 +0800 |
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On Wed, 2016-11-16 at 19:16 +0000, Colin King wrote: > From: Colin Ian King <colin.king@canonical.com> > > pdev is dereferenced using platform_get_drvdata before a check to > see if it is null, hence there could be a potential null pointer > dereference issue. Instead, first check if pdev is null and only then > deference pdev when initializing vpu. > > Found with static analysis by CoverityScan, CID 1357797 > > Signed-off-by: Colin Ian King <colin.king@canonical.com> > ---
Reviewed-by: Andrew-CT Chen <andrew-ct.chen@mediatek.com>
> drivers/media/platform/mtk-vpu/mtk_vpu.c | 6 ++++-- > 1 file changed, 4 insertions(+), 2 deletions(-) > > diff --git a/drivers/media/platform/mtk-vpu/mtk_vpu.c b/drivers/media/platform/mtk-vpu/mtk_vpu.c > index c9bf58c..41f31b2 100644 > --- a/drivers/media/platform/mtk-vpu/mtk_vpu.c > +++ b/drivers/media/platform/mtk-vpu/mtk_vpu.c > @@ -523,9 +523,9 @@ 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; > > @@ -533,6 +533,8 @@ int vpu_load_firmware(struct platform_device *pdev) > dev_err(dev, "VPU platform device is invalid\n"); > return -EINVAL; > } > + vpu = platform_get_drvdata(pdev); > + run = &vpu->run; > > mutex_lock(&vpu->vpu_mutex); > if (vpu->fw_loaded) {
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