[FFmpeg-devel] [PATCH 3/4] avformat/avidec: Avoid integer overflow in NI switch check

[Paul B Mahol]

probably ok

On 2/15/20, Michael Niedermayer <michael at niedermayer.cc> wrote:
> Fixes: signed integer overflow: 0 - -9223372036854775808 cannot be
> represented in type 'long'
> Fixes: Ticket8149
>
> Found-by: Suhwan
> Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
> ---
>  libavformat/avidec.c | 7 ++++---
>  1 file changed, 4 insertions(+), 3 deletions(-)
>
> diff --git a/libavformat/avidec.c b/libavformat/avidec.c
> index ae0c227bb9..412e4a8479 100644
> --- a/libavformat/avidec.c
> +++ b/libavformat/avidec.c
> @@ -1532,11 +1532,12 @@ resync:
>          if (!avi->non_interleaved && st->nb_index_entries>1 &&
> avi->index_loaded>1) {
>              int64_t dts= av_rescale_q(pkt->dts, st->time_base,
> AV_TIME_BASE_Q);
>
> -            if (avi->dts_max - dts > 2*AV_TIME_BASE) {
> +            if (avi->dts_max < dts) {
> +                avi->dts_max = dts;
> +            } else if (avi->dts_max - (uint64_t)dts > 2*AV_TIME_BASE) {
>                  avi->non_interleaved= 1;
>                  av_log(s, AV_LOG_INFO, "Switching to NI mode, due to poor
> interleaving\n");
> -            }else if (avi->dts_max < dts)
> -                avi->dts_max = dts;
> +            }
>          }
>
>          return 0;
> --
> 2.17.1
>
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