drm/panfrost: Fix a BO leak in panfrost_ioctl_mmap_bo()

We should release the reference we grabbed when an error occurs.

Fixes: 187d2929206e ("drm/panfrost: Add support for GPU heap allocations")
Cc: <stable@vger.kernel.org>
Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com>
Reviewed-by: Steven Price <steven.price@arm.com>
Acked-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Signed-off-by: Rob Herring <robh@kernel.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20191129135908.2439529-4-boris.brezillon@collabora.com

diff --git a/drivers/gpu/drm/panfrost/panfrost_drv.c b/drivers/gpu/drm/panfrost/panfrost_drv.c
index 8b8d6546cfac2f38574db6136582731096d462ec..0a5d82078bc85ba7e37bc486e79481e3ebafba89 100644 (file)
--- a/drivers/gpu/drm/panfrost/panfrost_drv.c
+++ b/drivers/gpu/drm/panfrost/panfrost_drv.c
@@ -303,14 +303,17 @@ static int panfrost_ioctl_mmap_bo(struct drm_device *dev, void *data,
        }
 
        /* Don't allow mmapping of heap objects as pages are not pinned. */
-       if (to_panfrost_bo(gem_obj)->is_heap)
-               return -EINVAL;
+       if (to_panfrost_bo(gem_obj)->is_heap) {
+               ret = -EINVAL;
+               goto out;
+       }
 
        ret = drm_gem_create_mmap_offset(gem_obj);
        if (ret == 0)
                args->offset = drm_vma_node_offset_addr(&gem_obj->vma_node);
-       drm_gem_object_put_unlocked(gem_obj);
 
+out:
+       drm_gem_object_put_unlocked(gem_obj);
        return ret;
 }