The "lat_buf->private_data" needs to be set to NULL to prevent a
double free. How this would happen is if vdec_msg_queue_init() failed
twice in a row and on the second time it failed earlier than on the
first time.
The vdec_msg_queue_init() function has a loop which does:
for (i = 0; i < NUM_BUFFER_COUNT; i++) {
Each iteration initializes one element in the msg_queue->lat_buf[] array
and then the clean up function vdec_msg_queue_deinit() frees each
element of the msg_queue->lat_buf[] array. This clean up code relies
on the assumption that every element is either initialized or zeroed.
Leaving a freed pointer which is non-zero breaks the assumption.
Fixes: b199fe46f35c ("media: mtk-vcodec: Add msg queue feature for lat and core architecture")
Signed-off-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
---
drivers/media/platform/mediatek/vcodec/vdec_msg_queue.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/drivers/media/platform/mediatek/vcodec/vdec_msg_queue.c b/drivers/media/platform/mediatek/vcodec/vdec_msg_queue.c
index f555341ae708..92ac82eb444e 100644
--- a/drivers/media/platform/mediatek/vcodec/vdec_msg_queue.c
+++ b/drivers/media/platform/mediatek/vcodec/vdec_msg_queue.c
@@ -231,6 +231,7 @@ void vdec_msg_queue_deinit(struct vdec_msg_queue *msg_queue,
mtk_vcodec_mem_free(ctx, mem);
kfree(lat_buf->private_data);
+ lat_buf->private_data = NULL;
}
cancel_work_sync(&msg_queue->core_work);
--
2.39.2
