Q: Given the following code slice:
```
1 static long qxl_fence_wait(struct dma_fence *fence, bool intr,
2 			   signed long timeout)
3 {
4 	struct qxl_device *qdev;
5 	struct qxl_release *release;
6 	int count = 0, sc = 0;
7 	bool have_drawable_releases;
8 	unsigned long cur, end = jiffies + timeout;
9 
10 	qdev = container_of(fence->lock, struct qxl_device, release_lock);
11 	release = container_of(fence, struct qxl_release, base);
12 	have_drawable_releases = release->type == QXL_RELEASE_DRAWABLE;
13 
14 retry:
15 	sc++;
16 
17 	if (dma_fence_is_signaled(fence))
18 		goto signaled;
19 
20 	qxl_io_notify_oom(qdev);
21 
22 	for (count = 0; count < 11; count++) {
23 		if (!qxl_queue_garbage_collect(qdev, true))
24 			break;
25 
26 		if (dma_fence_is_signaled(fence))
27 			goto signaled;
28 	}
29 
30 	if (dma_fence_is_signaled(fence))
31 		goto signaled;
32 
33 	if (have_drawable_releases || sc < 4) {
34 		if (sc > 2)
35 			/* back off */
36 			usleep_range(500, 1000);
37 
38 		if (time_after(jiffies, end))
39 			return 0;
40 
41 		if (have_drawable_releases && sc > 300) {
42 			DMA_FENCE_WARN(fence,
43 				       "failed to wait on release %llu after spincount %d\n",
44 				       fence->context & ~0xf0000000, sc);
45 			goto signaled;
46 		}
47 		goto retry;
48 	}
49 	/*
50 	 * yeah, original sync_obj_wait gave up after 3 spins when
51 	 * have_drawable_releases is not set.
52 	 */
53 
54 signaled:
55 	cur = jiffies;
56 	if (time_after(cur, end))
57 		return 0;
58 	return end - cur;
59 }
```
which has a vulnerability among CWE-125 and among lines:
```
5 	struct qxl_release *release;
```
Please generate five possible patches for the vulnerability.