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drm/virtio: Handle error from virtio_gpu_resource_id_get

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ida_alloc() can return -ENOMEM in the highly unlikely case we run out
of memory.  The current code creates an object with an invalid ID.

Signed-off-by: Matthew Wilcox <willy@infradead.org>
Link: http://patchwork.freedesktop.org/patch/msgid/20181030165352.13065-1-willy@infradead.org
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
This commit is contained in:
Matthew Wilcox 2018-10-30 09:53:51 -07:00 committed by Gerd Hoffmann
parent 7db647aa8b
commit 556c62e85f
1 changed files with 11 additions and 2 deletions
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13
drivers/gpu/drm/virtio/virtgpu_object.c
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@ -25,11 +25,16 @@
#include "virtgpu_drv.h"
static void virtio_gpu_resource_id_get(struct virtio_gpu_device *vgdev,
static int virtio_gpu_resource_id_get(struct virtio_gpu_device *vgdev,
uint32_t *resid)
{
int handle = ida_alloc_min(&vgdev->resource_ida, 1, GFP_KERNEL);
if (handle < 0)
return handle;
*resid = handle;
return 0;
}
static void virtio_gpu_resource_id_put(struct virtio_gpu_device *vgdev, uint32_t id)
@ -94,7 +99,11 @@ int virtio_gpu_object_create(struct virtio_gpu_device *vgdev,
bo = kzalloc(sizeof(struct virtio_gpu_object), GFP_KERNEL);
if (bo == NULL)
return -ENOMEM;
virtio_gpu_resource_id_get(vgdev, &bo->hw_res_handle);
ret = virtio_gpu_resource_id_get(vgdev, &bo->hw_res_handle);
if (ret < 0) {
kfree(bo);
return ret;
}
size = roundup(size, PAGE_SIZE);
ret = drm_gem_object_init(vgdev->ddev, &bo->gem_base, size);
if (ret != 0) {