[PATCH] [v2] drm/lima: fix a memleak in lima_heap_alloc

[Qiang Yu]

applied to drm-misc-next

On Wed, Jan 17, 2024 at 8:14 PM Qiang Yu <yuq825 at gmail.com> wrote:
>
> Reviewed-by: Qiang Yu <yuq825 at gmail.com>
>
> On Wed, Jan 17, 2024 at 3:14 PM Zhipeng Lu <alexious at zju.edu.cn> wrote:
> >
> > When lima_vm_map_bo fails, the resources need to be deallocated, or
> > there will be memleaks.
> >
> > Fixes: 6aebc51d7aef ("drm/lima: support heap buffer creation")
> > Signed-off-by: Zhipeng Lu <alexious at zju.edu.cn>
> > ---
> > Changelog:
> >
> > v2: rearrange the error-handling to ladder tags.
> > ---
> >  drivers/gpu/drm/lima/lima_gem.c | 23 +++++++++++++++--------
> >  1 file changed, 15 insertions(+), 8 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/lima/lima_gem.c b/drivers/gpu/drm/lima/lima_gem.c
> > index 4f9736e5f929..d3d82ee7fb4c 100644
> > --- a/drivers/gpu/drm/lima/lima_gem.c
> > +++ b/drivers/gpu/drm/lima/lima_gem.c
> > @@ -75,29 +75,36 @@ int lima_heap_alloc(struct lima_bo *bo, struct lima_vm *vm)
> >         } else {
> >                 bo->base.sgt = kmalloc(sizeof(*bo->base.sgt), GFP_KERNEL);
> >                 if (!bo->base.sgt) {
> > -                       sg_free_table(&sgt);
> > -                       return -ENOMEM;
> > +                       ret = -ENOMEM;
> > +                       goto err_out0;
> >                 }
> >         }
> >
> >         ret = dma_map_sgtable(dev, &sgt, DMA_BIDIRECTIONAL, 0);
> >         if (ret) {
> > -               sg_free_table(&sgt);
> > -               kfree(bo->base.sgt);
> > -               bo->base.sgt = NULL;
> > -               return ret;
> > +               goto err_out1;
> >         }
> >
> >         *bo->base.sgt = sgt;
> >
> >         if (vm) {
> >                 ret = lima_vm_map_bo(vm, bo, old_size >> PAGE_SHIFT);
> > -               if (ret)
> > -                       return ret;
> > +               if (ret) {
> > +                       goto err_out2;
> > +               }
> >         }
> >
> >         bo->heap_size = new_size;
> >         return 0;
> > +
> > +err_out2:
> > +       dma_unmap_sgtable(dev, &sgt, DMA_BIDIRECTIONAL, 0);
> > +err_out1:
> > +       kfree(bo->base.sgt);
> > +       bo->base.sgt = NULL;
> > +err_out0:
> > +       sg_free_table(&sgt);
> > +       return ret;
> >  }
> >
> >  int lima_gem_create_handle(struct drm_device *dev, struct drm_file *file,
> > --
> > 2.34.1
> >