[PATCH] drm/i915/gt: Potential error pointer dereference in pinned_context()

[Rodrigo Vivi]

On Fri, Aug 13, 2021 at 04:01:06PM +0200, Thomas Hellström wrote:
> 
> On 8/13/21 1:36 PM, Dan Carpenter wrote:
> > If the intel_engine_create_pinned_context() function returns an error
> > pointer, then dereferencing "ce" will Oops.  Use "vm" instead of
> > "ce->vm".
> > 
> > Fixes: cf586021642d ("drm/i915/gt: Pipelined page migration")
> > Signed-off-by: Dan Carpenter <dan.carpenter at oracle.com>
> > ---
> >   drivers/gpu/drm/i915/gt/intel_migrate.c | 2 +-
> >   1 file changed, 1 insertion(+), 1 deletion(-)
> > 
> > diff --git a/drivers/gpu/drm/i915/gt/intel_migrate.c b/drivers/gpu/drm/i915/gt/intel_migrate.c
> > index d0a7c934fd3b..1dac21aa7e5c 100644
> > --- a/drivers/gpu/drm/i915/gt/intel_migrate.c
> > +++ b/drivers/gpu/drm/i915/gt/intel_migrate.c
> > @@ -177,7 +177,7 @@ static struct intel_context *pinned_context(struct intel_gt *gt)
> >   	ce = intel_engine_create_pinned_context(engine, vm, SZ_512K,
> >   						I915_GEM_HWS_MIGRATE,
> >   						&key, "migrate");
> > -	i915_vm_put(ce->vm);
> > +	i915_vm_put(vm);
> >   	return ce;
> >   }
> 
> Thanks,
> 
> Reviewed-by: Thomas Hellström <thomas.hellstrom at linux.intel.com>

And pushed to drm-intel-gt-next, thanks for the patch and review.

> 
>