On 5/19/17 3:47 PM, Anton Khirnov wrote:
> This tells the parsing functions the payload size and prevents them from
> overreading.
> ---
> libavcodec/h264_sei.c | 23 +++++++++++++----------
> 1 file changed, 13 insertions(+), 10 deletions(-)
>
> diff --git a/libavcodec/h264_sei.c b/libavcodec/h264_sei.c
> index 17f89ce..2e52227 100644
> --- a/libavcodec/h264_sei.c
> +++ b/libavcodec/h264_sei.c
> @@ -350,6 +350,7 @@ int ff_h264_sei_decode(H264SEIContext *h, GetBitContext
> *gb,
> const H264ParamSets *ps, void *logctx)
> {
> while (get_bits_left(gb) > 16) {
> + GetBitContext gb_payload;
> int size = 0;
> int type = 0;
> int ret = 0;
> @@ -374,37 +375,39 @@ int ff_h264_sei_decode(H264SEIContext *h, GetBitContext
> *gb,
> return AVERROR_INVALIDDATA;
> }
>
> + ret = init_get_bits8(&gb_payload, gb->buffer + get_bits_count(gb) /
> 8, size);
> + if (ret < 0)
> + return ret;
> +
> switch (type) {
> case SEI_TYPE_PIC_TIMING: // Picture timing SEI
> - ret = decode_picture_timing(&h->picture_timing, gb, ps->sps,
> logctx);
> + ret = decode_picture_timing(&h->picture_timing, &gb_payload,
> ps->sps, logctx);
> break;
> case SEI_TYPE_USER_DATA_REGISTERED:
> - ret = decode_registered_user_data(h, gb, logctx, size);
> + ret = decode_registered_user_data(h, &gb_payload, logctx, size);
> break;
> case SEI_TYPE_USER_DATA_UNREGISTERED:
> - ret = decode_unregistered_user_data(&h->unregistered, gb,
> logctx, size);
> + ret = decode_unregistered_user_data(&h->unregistered,
> &gb_payload, logctx, size);
> break;
> case SEI_TYPE_RECOVERY_POINT:
> - ret = decode_recovery_point(&h->recovery_point, gb);
> + ret = decode_recovery_point(&h->recovery_point, &gb_payload);
> break;
> case SEI_TYPE_BUFFERING_PERIOD:
> - ret = decode_buffering_period(&h->buffering_period, gb, ps,
> logctx);
> + ret = decode_buffering_period(&h->buffering_period, &gb_payload,
> ps, logctx);
> break;
> case SEI_TYPE_FRAME_PACKING:
> - ret = decode_frame_packing_arrangement(&h->frame_packing, gb);
> + ret = decode_frame_packing_arrangement(&h->frame_packing,
> &gb_payload);
> break;
> case SEI_TYPE_DISPLAY_ORIENTATION:
> - ret = decode_display_orientation(&h->display_orientation, gb);
> + ret = decode_display_orientation(&h->display_orientation,
> &gb_payload);
> break;
> default:
> av_log(logctx, AV_LOG_DEBUG, "unknown SEI type %d\n", type);
> - skip_bits(gb, 8 * size);
> }
> if (ret < 0)
> return ret;
>
> - // FIXME check bits here
> - align_get_bits(gb);
> + skip_bits(gb, 8 * size);
> }
>
> return 0;
>
Probably Ok.
lu
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