Re: [PATCH] media: omap_vout: potential buffer overflow in vidioc_dqbuf()

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On Wed, Apr 10, 2019 at 12:50:31PM +0200, Hans Verkuil wrote:
> On 4/9/19 1:29 PM, Dan Carpenter wrote:
> > diff --git a/drivers/media/platform/omap/omap_vout.c b/drivers/media/platform/omap/omap_vout.c
> > index 37f0d7146dfa..15e38990e85a 100644
> > --- a/drivers/media/platform/omap/omap_vout.c
> > +++ b/drivers/media/platform/omap/omap_vout.c
> > @@ -1527,8 +1527,6 @@ static int vidioc_dqbuf(struct file *file, void *fh, struct v4l2_buffer *b)
> >  	unsigned long size;
> >  	struct videobuf_buffer *vb;
> >  
> > -	vb = q->bufs[b->index];
> > -
> >  	if (!vout->streaming)
> >  		return -EINVAL;
> >  
> > @@ -1539,6 +1537,8 @@ static int vidioc_dqbuf(struct file *file, void *fh, struct v4l2_buffer *b)
> >  		/* Call videobuf_dqbuf for  blocking mode */
> >  		ret = videobuf_dqbuf(q, (struct v4l2_buffer *)b, 0);
> 
> We need a:
> 
> 	if (ret)
> 		return ret;
> 
> here. Or alternatively, add 'if (!ret)' around the next five lines.
> 
> b->index is only valid if the videobuf_dqbuf call returned 0.
> 

Doh.  Thanks.

regards,
dan carpenter




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