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rv34: check that subsequent slices have the same type as first one.

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This prevents some crashes when corrupted bitstream reports e.g. P-type
slice in I-frame. Official RealVideo decoder demands all slices to be
of the same type too.

Signed-off-by: Anton Khirnov <anton@khirnov.net>
This commit is contained in:
Kostya Shishkov 2011-09-12 11:39:53 +02:00 committed by Anton Khirnov
parent 47a8589f7b
commit 23a1f0c592
1 changed files with 7 additions and 0 deletions
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7
libavcodec/rv34.c
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@ -1336,6 +1336,13 @@ static int rv34_decode_slice(RV34DecContext *r, int end, const uint8_t* buf, int
}
}
s->mb_x = s->mb_y = 0;
} else {
int slice_type = r->si.type ? r->si.type : AV_PICTURE_TYPE_I;
if (slice_type != s->pict_type) {
av_log(s->avctx, AV_LOG_ERROR, "Slice type mismatch\n");
return AVERROR_INVALIDDATA;
}
}
r->si.end = end;