6.4-stable review patch. If anyone has any objections, please let me know.
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From: Dan Carpenter dan.carpenter@linaro.org
[ Upstream commit be40f524b6edac4fb9a98ef79620fd9b9497a998 ]
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@linaro.org Reviewed-by: Nicolas Dufresne nicolas.dufresne@collabora.com Signed-off-by: Hans Verkuil hverkuil-cisco@xs4all.nl Signed-off-by: Sasha Levin sashal@kernel.org --- 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 03f8d7cd8eddc..675f62814f94e 100644 --- a/drivers/media/platform/mediatek/vcodec/vdec_msg_queue.c +++ b/drivers/media/platform/mediatek/vcodec/vdec_msg_queue.c @@ -246,6 +246,7 @@ 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; } }