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[wvdecrypter] Fix memory heap corruption #1346

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merged 2 commits into from
Aug 2, 2023
Merged

[wvdecrypter] Fix memory heap corruption #1346

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75b9724
[wvdecrypter] Fix memory heap corruption
CastagnaIT Jul 31, 2023
7e364a0
[wvdecrypter_android] Fix memory heap corruption
CastagnaIT Aug 1, 2023
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17 changes: 6 additions & 11 deletions wvdecrypter/wvdecrypter.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -1162,11 +1162,8 @@ AP4_Result WV_CencSingleSampleDecrypter::DecryptSampleData(AP4_UI32 pool_id,

if (fragInfo.nal_length_size_ && (!iv || bytes_of_cleartext_data[0] > 0))
{
//Note that we assume that there is enough data in data_out to hold everything without reallocating.

//check NAL / subsample
const AP4_Byte *packet_in(data_in.GetData()), *packet_in_e(data_in.GetData() + data_in.GetDataSize());
AP4_Byte *packet_out(data_out.UseData() + data_out.GetDataSize());
AP4_UI16 *clrb_out(iv ? reinterpret_cast<AP4_UI16*>(data_out.UseData() + sizeof(subsample_count)):nullptr);
unsigned int nalunitcount(0), nalunitsum(0), configSize(0);

Expand All @@ -1178,19 +1175,18 @@ AP4_Result WV_CencSingleSampleDecrypter::DecryptSampleData(AP4_UI32 pool_id,
//look if we have to inject sps / pps
if (fragInfo.annexb_sps_pps_.GetDataSize() && (*packet_in & 0x1F) != 9 /*AVC_NAL_AUD*/)
{
memcpy(packet_out, fragInfo.annexb_sps_pps_.GetData(), fragInfo.annexb_sps_pps_.GetDataSize());
packet_out += fragInfo.annexb_sps_pps_.GetDataSize();
data_out.AppendData(fragInfo.annexb_sps_pps_.GetData(),
fragInfo.annexb_sps_pps_.GetDataSize());
if(clrb_out) *clrb_out += fragInfo.annexb_sps_pps_.GetDataSize();
configSize = fragInfo.annexb_sps_pps_.GetDataSize();
fragInfo.annexb_sps_pps_.SetDataSize(0);
}

//Anex-B Start pos
packet_out[0] = packet_out[1] = packet_out[2] = 0; packet_out[3] = 1;
packet_out += 4;
memcpy(packet_out, packet_in, nalsize);
// Annex-B Start pos
static AP4_Byte annexbStartCode[4] = {0x00, 0x00, 0x00, 0x01};
data_out.AppendData(annexbStartCode, 4);
data_out.AppendData(packet_in, nalsize);
packet_in += nalsize;
packet_out += nalsize;
if (clrb_out) *clrb_out += (4 - fragInfo.nal_length_size_);
++nalunitcount;

Expand Down Expand Up @@ -1230,7 +1226,6 @@ AP4_Result WV_CencSingleSampleDecrypter::DecryptSampleData(AP4_UI32 pool_id,
static_cast<unsigned int>(packet_in_e - packet_in), subsample_count);
return AP4_ERROR_NOT_SUPPORTED;
}
data_out.SetDataSize(data_out.GetDataSize() + data_in.GetDataSize() + configSize + (4 - fragInfo.nal_length_size_) * nalunitcount);
}
else
data_out.AppendData(data_in.GetData(), data_in.GetDataSize());
Expand Down
17 changes: 6 additions & 11 deletions wvdecrypter/wvdecrypter_android.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -1121,11 +1121,8 @@ AP4_Result WV_CencSingleSampleDecrypter::DecryptSampleData(AP4_UI32 pool_id,

if (fragInfo.nal_length_size_ && (!iv || bytes_of_cleartext_data[0] > 0))
{
//Note that we assume that there is enough data in data_out to hold everything without reallocating.

//check NAL / subsample
const AP4_Byte *packet_in(data_in.GetData()), *packet_in_e(data_in.GetData() + data_in.GetDataSize());
AP4_Byte *packet_out(data_out.UseData() + data_out.GetDataSize());
AP4_UI16 *clrb_out(iv ? reinterpret_cast<AP4_UI16*>(data_out.UseData() + sizeof(subsample_count)) : nullptr);
unsigned int nalunitcount(0), nalunitsum(0), configSize(0);

Expand All @@ -1137,19 +1134,18 @@ AP4_Result WV_CencSingleSampleDecrypter::DecryptSampleData(AP4_UI32 pool_id,
//look if we have to inject sps / pps
if (fragInfo.annexb_sps_pps_.GetDataSize() && (*packet_in & 0x1F) != 9 /*AVC_NAL_AUD*/)
{
memcpy(packet_out, fragInfo.annexb_sps_pps_.GetData(), fragInfo.annexb_sps_pps_.GetDataSize());
packet_out += fragInfo.annexb_sps_pps_.GetDataSize();
data_out.AppendData(fragInfo.annexb_sps_pps_.GetData(),
fragInfo.annexb_sps_pps_.GetDataSize());
if (clrb_out) *clrb_out += fragInfo.annexb_sps_pps_.GetDataSize();
configSize = fragInfo.annexb_sps_pps_.GetDataSize();
fragInfo.annexb_sps_pps_.SetDataSize(0);
}

//Anex-B Start pos
packet_out[0] = packet_out[1] = packet_out[2] = 0; packet_out[3] = 1;
packet_out += 4;
memcpy(packet_out, packet_in, nalsize);
// Annex-B Start pos
static AP4_Byte annexbStartCode[4] = {0x00, 0x00, 0x00, 0x01};
data_out.AppendData(annexbStartCode, 4);
data_out.AppendData(packet_in, nalsize);
packet_in += nalsize;
packet_out += nalsize;
if (clrb_out) *clrb_out += (4 - fragInfo.nal_length_size_);
++nalunitcount;

Expand Down Expand Up @@ -1188,7 +1184,6 @@ AP4_Result WV_CencSingleSampleDecrypter::DecryptSampleData(AP4_UI32 pool_id,
fragInfo.nal_length_size_, (int)(packet_in_e - packet_in), subsample_count);
return AP4_ERROR_NOT_SUPPORTED;
}
data_out.SetDataSize(data_out.GetDataSize() + data_in.GetDataSize() + configSize + (4 - fragInfo.nal_length_size_) * nalunitcount);
}
else
{
Expand Down
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