From: Mitchel Humpherys <mitchelh@codeaurora.org>
Date: Sat, 14 Dec 2013 03:26:17 +0000 (-0800)
Subject: gpu: ion: fix use-after-free in ion_heap_freelist_drain
X-Git-Tag: v3.14-rc1~13^2~388
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=f020b4430bf29a25229fd9975662baefb02facda;p=profile%2Fivi%2Fkernel-x86-ivi.git

gpu: ion: fix use-after-free in ion_heap_freelist_drain

The `buffer' variable is being used after being freed. Fix this.

Signed-off-by: Mitchel Humpherys <mitchelh@codeaurora.org>
Signed-off-by: John Stultz <john.stultz@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/drivers/staging/android/ion/ion_heap.c b/drivers/staging/android/ion/ion_heap.c
index deaab7c..0a5cea0 100644
--- a/drivers/staging/android/ion/ion_heap.c
+++ b/drivers/staging/android/ion/ion_heap.c
@@ -200,9 +200,9 @@ size_t ion_heap_freelist_drain(struct ion_heap *heap, size_t size)
 		if (total_drained >= size)
 			break;
 		list_del(&buffer->list);
-		ion_buffer_destroy(buffer);
 		heap->free_list_size -= buffer->size;
 		total_drained += buffer->size;
+		ion_buffer_destroy(buffer);
 	}
 	rt_mutex_unlock(&heap->lock);