On Tue, Oct 22, 2019 at 10:53:57PM -0500, Navid Emamdoost wrote:
> On Tue, Oct 22, 2019 at 4:36 AM Daniel Vetter <daniel@xxxxxxxx> wrote:
> >
> > On Mon, Oct 21, 2019 at 01:52:49PM -0500, Navid Emamdoost wrote:
> > > In the impelementation of v3d_submit_cl_ioctl() there are two memory
> > > leaks. One is when allocation for bin fails, and the other is when bin
> > > initialization fails. If kcalloc fails to allocate memory for bin then
> > > render->base should be put. Also, if v3d_job_init() fails to initialize
> > > bin->base then allocated memory for bin should be released.
> > >
> > > Fixes: a783a09ee76d ("drm/v3d: Refactor job management.")
> > > Signed-off-by: Navid Emamdoost <navid.emamdoost@xxxxxxxxx>
> > > ---
> > > drivers/gpu/drm/v3d/v3d_gem.c | 5 ++++-
> > > 1 file changed, 4 insertions(+), 1 deletion(-)
> > >
> > > diff --git a/drivers/gpu/drm/v3d/v3d_gem.c b/drivers/gpu/drm/v3d/v3d_gem.c
> > > index 5d80507b539b..19c092d75266 100644
> > > --- a/drivers/gpu/drm/v3d/v3d_gem.c
> > > +++ b/drivers/gpu/drm/v3d/v3d_gem.c
> > > @@ -557,13 +557,16 @@ v3d_submit_cl_ioctl(struct drm_device *dev, void *data,
> > >
> > > if (args->bcl_start != args->bcl_end) {
> > > bin = kcalloc(1, sizeof(*bin), GFP_KERNEL);
> > > - if (!bin)
> > > + if (!bin) {
> > > + v3d_job_put(&render->base);
> >
> > The job isn't initialized yet, this doesn't work.
> Do you mean we have to release render via kfree() here?
>
> >
> > > return -ENOMEM;
> > > + }
> > >
> > > ret = v3d_job_init(v3d, file_priv, &bin->base,
> > > v3d_job_free, args->in_sync_bcl);
> > > if (ret) {
> > > v3d_job_put(&render->base);
> >
> > v3d_job_put will call kfree, if you chase the callchain long enough (in
> > v3d_job_free). So no bug here, this would lead to a double kfree and
> > crash.
> Yes, v3d_job_put() takes care of render,
>
> > -Daniel
> >
> > > + kfree(bin);
> but how about leaking bin?
Sorry, I totally missed that this is bin, no render. Patch looks correct
to me.
Reviewed-by: Daniel Vetter <daniel.vetter@xxxxxxxx>
>
> > > return ret;
> > > }
> > >
> > > --
> > > 2.17.1
> > >
> >
> > --
> > Daniel Vetter
> > Software Engineer, Intel Corporation
> > http://blog.ffwll.ch
>
>
>
> --
> Navid.
--
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
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