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avfilter/avf_concat: check for possible integer overflow

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Also check that segment delta pts is always bigger than input pts.

There is nothing much currently that can be done to recover from
this situation so just return AVERROR_INVALIDDATA error code.
This commit is contained in:
Paul B Mahol 2020-09-13 13:33:49 +02:00
parent 17b44f759e
commit 05c8d0bce6
1 changed files with 4 additions and 0 deletions
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libavfilter/avf_concat.c
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@ -251,6 +251,10 @@ static int send_silence(AVFilterContext *ctx, unsigned in_no, unsigned out_no,
if (!rate_tb.den)
return AVERROR_BUG;
if (cat->in[in_no].pts < INT64_MIN + seg_delta)
return AVERROR_INVALIDDATA;
if (seg_delta < cat->in[in_no].pts)
return AVERROR_INVALIDDATA;
nb_samples = av_rescale_q(seg_delta - cat->in[in_no].pts,
outlink->time_base, rate_tb);
frame_nb_samples = FFMAX(9600, rate_tb.den / 5); /* arbitrary */