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avcodec/h264_ps: Fix copying oversized pps&sps data 

Fixes: https://trac.ffmpeg.org/attachment/ticket/685/movie.264

In the available testcase the actual PPS only uses a few bits
while there are 7kbyte of apparently random data after it

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2015-10-02 21:02:08 +02:00
parent 5fa5e73e81
commit 85c92789b6
1 changed files with 6 additions and 4 deletions
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10
libavcodec/h264_ps.c
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@ -312,8 +312,10 @@ int ff_h264_decode_seq_parameter_set(H264Context *h, int ignore_truncation)
return AVERROR(ENOMEM);
sps->data_size = h->gb.buffer_end - h->gb.buffer;
if (sps->data_size > sizeof(sps->data))
goto fail;
if (sps->data_size > sizeof(sps->data)) {
av_log(h->avctx, AV_LOG_WARNING, "Truncating likely oversized SPS\n");
sps->data_size = sizeof(sps->data);
}
memcpy(sps->data, h->gb.buffer, sps->data_size);
profile_idc = get_bits(&h->gb, 8);
@ -611,8 +613,8 @@ int ff_h264_decode_picture_parameter_set(H264Context *h, int bit_length)
return AVERROR(ENOMEM);
pps->data_size = h->gb.buffer_end - h->gb.buffer;
if (pps->data_size > sizeof(pps->data)) {
ret = AVERROR_INVALIDDATA;
goto fail;
av_log(h->avctx, AV_LOG_WARNING, "Truncating likely oversized PPS\n");
pps->data_size = sizeof(pps->data);
}
memcpy(pps->data, h->gb.buffer, pps->data_size);
pps->sps_id = get_ue_golomb_31(&h->gb);