[PATCH 5.4 44/80] drm/panfrost: Fix a BO leak in panfrost_ioctl_mmap_bo()

[Greg Kroah-Hartman]

From: Boris Brezillon <boris.brezillon@xxxxxxxxxxxxx>

commit 3bb69dbcb9e8430e0cc9990cff427ca3ae25ffdc upstream.

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

Fixes: 187d2929206e ("drm/panfrost: Add support for GPU heap allocations")
Cc: <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Boris Brezillon <boris.brezillon@xxxxxxxxxxxxx>
Reviewed-by: Steven Price <steven.price@xxxxxxx>
Acked-by: Alyssa Rosenzweig <alyssa.rosenzweig@xxxxxxxxxxxxx>
Signed-off-by: Rob Herring <robh@xxxxxxxxxx>
Link: https://patchwork.freedesktop.org/patch/msgid/20191129135908.2439529-4-boris.brezillon@xxxxxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 drivers/gpu/drm/panfrost/panfrost_drv.c |    9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

--- 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
 	}
 
 	/* 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;
 }