diff mbox series

[1/3] media: mediatek: vcodec: fix h264 multi statless decoder smatch warning

Message ID 20240229095611.6698-2-yunfei.dong@mediatek.com
State Superseded
Headers show
Series media: mediatek: vcodec: fix vcodec smatch warning | expand

Commit Message

Yunfei Dong (董云飞) Feb. 29, 2024, 9:56 a.m. UTC
Fix smatch static checker warning for vdec_h264_req_multi_if.c.
Leading to kernel crash when fb is NULL.

Fixes: 397edc703a10 ("media: mediatek: vcodec: add h264 decoder")
Signed-off-by: Yunfei Dong <yunfei.dong@mediatek.com>
---
 .../vcodec/decoder/vdec/vdec_h264_req_multi_if.c         | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

Comments

AngeloGioacchino Del Regno April 2, 2024, 9:50 a.m. UTC | #1
Il 29/02/24 10:56, Yunfei Dong ha scritto:
> Fix smatch static checker warning for vdec_h264_req_multi_if.c.
> Leading to kernel crash when fb is NULL.
> 
> Fixes: 397edc703a10 ("media: mediatek: vcodec: add h264 decoder")
> Signed-off-by: Yunfei Dong <yunfei.dong@mediatek.com>
> ---
>   .../vcodec/decoder/vdec/vdec_h264_req_multi_if.c         | 9 +++++++--
>   1 file changed, 7 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/media/platform/mediatek/vcodec/decoder/vdec/vdec_h264_req_multi_if.c b/drivers/media/platform/mediatek/vcodec/decoder/vdec/vdec_h264_req_multi_if.c
> index 0e741e0dc8ba..ab8e708e0df1 100644
> --- a/drivers/media/platform/mediatek/vcodec/decoder/vdec/vdec_h264_req_multi_if.c
> +++ b/drivers/media/platform/mediatek/vcodec/decoder/vdec/vdec_h264_req_multi_if.c
> @@ -724,11 +724,16 @@ static int vdec_h264_slice_single_decode(void *h_vdec, struct mtk_vcodec_mem *bs
>   		return vpu_dec_reset(vpu);
>   
>   	fb = inst->ctx->dev->vdec_pdata->get_cap_buffer(inst->ctx);
> +	if (!fb) {
> +		mtk_vdec_err(inst->ctx, "fb buffer is NULL");
> +		return -EBUSY;
> +	}
> +
>   	src_buf_info = container_of(bs, struct mtk_video_dec_buf, bs_buffer);
>   	dst_buf_info = container_of(fb, struct mtk_video_dec_buf, frame_buffer);
>   
> -	y_fb_dma = fb ? (u64)fb->base_y.dma_addr : 0;
> -	c_fb_dma = fb ? (u64)fb->base_c.dma_addr : 0;

You're changing the behavior here, can you please explain why this change is valid
into the commit description?

Thanks,
Angelo

> +	y_fb_dma = (u64)fb->base_y.dma_addr;
> +	c_fb_dma = (u64)fb->base_c.dma_addr;
>   	mtk_vdec_debug(inst->ctx, "[h264-dec] [%d] y_dma=%llx c_dma=%llx",
>   		       inst->ctx->decoded_frame_cnt, y_fb_dma, c_fb_dma);
>
Yunfei Dong (董云飞) April 3, 2024, 3:45 a.m. UTC | #2
Hi AngeloGioacchino,

Thanks for your reviewing.
On Tue, 2024-04-02 at 11:50 +0200, AngeloGioacchino Del Regno wrote:
> Il 29/02/24 10:56, Yunfei Dong ha scritto:
> > Fix smatch static checker warning for vdec_h264_req_multi_if.c.
> > Leading to kernel crash when fb is NULL.
> > 
> > Fixes: 397edc703a10 ("media: mediatek: vcodec: add h264 decoder")
> > Signed-off-by: Yunfei Dong <yunfei.dong@mediatek.com>
> > ---
> >   .../vcodec/decoder/vdec/vdec_h264_req_multi_if.c         | 9
> > +++++++--
> >   1 file changed, 7 insertions(+), 2 deletions(-)
> > 
> > diff --git
> > a/drivers/media/platform/mediatek/vcodec/decoder/vdec/vdec_h264_req
> > _multi_if.c
> > b/drivers/media/platform/mediatek/vcodec/decoder/vdec/vdec_h264_req
> > _multi_if.c
> > index 0e741e0dc8ba..ab8e708e0df1 100644
> > ---
> > a/drivers/media/platform/mediatek/vcodec/decoder/vdec/vdec_h264_req
> > _multi_if.c
> > +++
> > b/drivers/media/platform/mediatek/vcodec/decoder/vdec/vdec_h264_req
> > _multi_if.c
> > @@ -724,11 +724,16 @@ static int vdec_h264_slice_single_decode(void
> > *h_vdec, struct mtk_vcodec_mem *bs
> >   		return vpu_dec_reset(vpu);
> >   
> >   	fb = inst->ctx->dev->vdec_pdata->get_cap_buffer(inst->ctx);
> > +	if (!fb) {
> > +		mtk_vdec_err(inst->ctx, "fb buffer is NULL");
> > +		return -EBUSY;
> > +	}
> > +
> >   	src_buf_info = container_of(bs, struct mtk_video_dec_buf,
> > bs_buffer);
> >   	dst_buf_info = container_of(fb, struct mtk_video_dec_buf,
> > frame_buffer);
> >   
> > -	y_fb_dma = fb ? (u64)fb->base_y.dma_addr : 0;
> > -	c_fb_dma = fb ? (u64)fb->base_c.dma_addr : 0;
> 
> You're changing the behavior here, can you please explain why this
> change is valid
> into the commit description?
> 
The driver already add the condition to check whether fb is NULL at the
front, no need these two lines again.

> Thanks,
> Angelo
> 
Best Regards,
Yunfei Dong
> > +	y_fb_dma = (u64)fb->base_y.dma_addr;
> > +	c_fb_dma = (u64)fb->base_c.dma_addr;
> >   	mtk_vdec_debug(inst->ctx, "[h264-dec] [%d] y_dma=%llx
> > c_dma=%llx",
> >   		       inst->ctx->decoded_frame_cnt, y_fb_dma,
> > c_fb_dma);
> >   
> 
> 
>
Yunfei Dong (董云飞) June 13, 2024, 9:28 a.m. UTC | #3
Hi Andrzej,

Thanks for your help to review this patch.

On Wed, 2024-05-29 at 15:14 +0200, Andrzej Pietrasiewicz wrote:
> Hi,
> 
> W dniu 3.04.2024 o 05:45, Yunfei Dong (董云飞) pisze:
> > Hi AngeloGioacchino,
> > 
> > Thanks for your reviewing.
> > On Tue, 2024-04-02 at 11:50 +0200, AngeloGioacchino Del Regno
> > wrote:
> > > Il 29/02/24 10:56, Yunfei Dong ha scritto:
> > > > Fix smatch static checker warning for vdec_h264_req_multi_if.c.
> > > > Leading to kernel crash when fb is NULL.
> > > > 
> > > > Fixes: 397edc703a10 ("media: mediatek: vcodec: add h264
> > > > decoder")
> > > > Signed-off-by: Yunfei Dong <yunfei.dong@mediatek.com>
> > > > ---
> > > >    .../vcodec/decoder/vdec/vdec_h264_req_multi_if.c         | 9
> > > > +++++++--
> > > >    1 file changed, 7 insertions(+), 2 deletions(-)
> > > > 
> > > > diff --git
> > > > a/drivers/media/platform/mediatek/vcodec/decoder/vdec/vdec_h264
> > > > _req
> > > > _multi_if.c
> > > > b/drivers/media/platform/mediatek/vcodec/decoder/vdec/vdec_h264
> > > > _req
> > > > _multi_if.c
> > > > index 0e741e0dc8ba..ab8e708e0df1 100644
> > > > ---
> > > > a/drivers/media/platform/mediatek/vcodec/decoder/vdec/vdec_h264
> > > > _req
> > > > _multi_if.c
> > > > +++
> > > > b/drivers/media/platform/mediatek/vcodec/decoder/vdec/vdec_h264
> > > > _req
> > > > _multi_if.c
> > > > @@ -724,11 +724,16 @@ static int
> > > > vdec_h264_slice_single_decode(void
> > > > *h_vdec, struct mtk_vcodec_mem *bs
> > > >    		return vpu_dec_reset(vpu);
> > > >    
> > > >    	fb = inst->ctx->dev->vdec_pdata->get_cap_buffer(inst-
> > > > >ctx);
> > > > +	if (!fb) {
> > > > +		mtk_vdec_err(inst->ctx, "fb buffer is NULL");
> > > > +		return -EBUSY;
> > > > +	}
> > > > +
> > > >    	src_buf_info = container_of(bs, struct
> > > > mtk_video_dec_buf,
> > > > bs_buffer);
> > > >    	dst_buf_info = container_of(fb, struct
> > > > mtk_video_dec_buf,
> > > > frame_buffer);
> > > >    
> > > > -	y_fb_dma = fb ? (u64)fb->base_y.dma_addr : 0;
> > > > -	c_fb_dma = fb ? (u64)fb->base_c.dma_addr : 0;
> > > 
> > > You're changing the behavior here, can you please explain why
> > > this
> > > change is valid
> > > into the commit description?
> > > 
> > 
> > The driver already add the condition to check whether fb is NULL at
> > the
> > front, no need these two lines again.
> > 
> 
> Maybe Angelo refers to the function never returning -EBUSY before?
> While at it, if fb is a kind of a buffer, why not -ENOMEM
> when get_cap_buffer() fails?
> 
Looks change the return value from EBUSY to ENOMEM much more
reasonable.

> Regards,
> 
> Andrzej
> 
Best Regards,
Yunfei Dong
> > > Thanks,
> > > Angelo
> > > 
> > 
> > Best Regards,
> > Yunfei Dong
> > > > +	y_fb_dma = (u64)fb->base_y.dma_addr;
> > > > +	c_fb_dma = (u64)fb->base_c.dma_addr;
> > > >    	mtk_vdec_debug(inst->ctx, "[h264-dec] [%d] y_dma=%llx
> > > > c_dma=%llx",
> > > >    		       inst->ctx->decoded_frame_cnt, y_fb_dma,
> > > > c_fb_dma);
> > > >    
> > > 
> > > 
> > > 
> 
>
diff mbox series

Patch

diff --git a/drivers/media/platform/mediatek/vcodec/decoder/vdec/vdec_h264_req_multi_if.c b/drivers/media/platform/mediatek/vcodec/decoder/vdec/vdec_h264_req_multi_if.c
index 0e741e0dc8ba..ab8e708e0df1 100644
--- a/drivers/media/platform/mediatek/vcodec/decoder/vdec/vdec_h264_req_multi_if.c
+++ b/drivers/media/platform/mediatek/vcodec/decoder/vdec/vdec_h264_req_multi_if.c
@@ -724,11 +724,16 @@  static int vdec_h264_slice_single_decode(void *h_vdec, struct mtk_vcodec_mem *bs
 		return vpu_dec_reset(vpu);
 
 	fb = inst->ctx->dev->vdec_pdata->get_cap_buffer(inst->ctx);
+	if (!fb) {
+		mtk_vdec_err(inst->ctx, "fb buffer is NULL");
+		return -EBUSY;
+	}
+
 	src_buf_info = container_of(bs, struct mtk_video_dec_buf, bs_buffer);
 	dst_buf_info = container_of(fb, struct mtk_video_dec_buf, frame_buffer);
 
-	y_fb_dma = fb ? (u64)fb->base_y.dma_addr : 0;
-	c_fb_dma = fb ? (u64)fb->base_c.dma_addr : 0;
+	y_fb_dma = (u64)fb->base_y.dma_addr;
+	c_fb_dma = (u64)fb->base_c.dma_addr;
 	mtk_vdec_debug(inst->ctx, "[h264-dec] [%d] y_dma=%llx c_dma=%llx",
 		       inst->ctx->decoded_frame_cnt, y_fb_dma, c_fb_dma);