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Fix Buffer Overflow when device numchannel changes #411

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Fix Buffer Overflow when device numchannel changes #411

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79 changes: 73 additions & 6 deletions RtAudio.cpp
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Expand Up @@ -2252,9 +2252,44 @@ bool RtApiCore :: callbackEvent( AudioDeviceID deviceId,
stream_.userBuffer[0], stream_.convertInfo[0] );
}
else { // copy from user buffer
memcpy( outBufferList->mBuffers[handle->iStream[0]].mData,
stream_.userBuffer[0],
outBufferList->mBuffers[handle->iStream[0]].mDataByteSize );

/* !!!
macOS can change a device's configuration during use. This can be observed, for example,
in the situation where a phone call is answered in macOS. When this situation occurs, it
is likely that the number of channels in the capture device is increased, causing an
increase in the buffer size and consequently a buffer overflow in the copying process.

The protection in relation to the buffer size change was not observed on the playback side,
however, it is interesting to leave this protection also in this direction of the audio.

!!! */

/* If the number of channels in coreaudio buffer is the same as the number of channels in user buffer, proceed with the copy normally. */
if (outBufferList->mBuffers[handle->iStream[0]].mNumberChannels == stream_.nUserChannels[0] &&
outBufferList->mBuffers[handle->iStream[0]].mDataByteSize == stream_.bufferSize * stream_.nUserChannels[0] * formatBytes( stream_.userFormat )) {
memcpy( outBufferList->mBuffers[handle->iStream[0]].mData, stream_.userBuffer[0], outBufferList->mBuffers[handle->iStream[0]].mDataByteSize);
}
else {
ConvertInfo info;

/* Assuming that if there is no conversion it is because the device and user formats are the same. */
info.channels = stream_.nUserChannels[0];
info.inFormat = stream_.userFormat;
info.outFormat = stream_.userFormat;
info.inJump = stream_.nUserChannels[0];
info.outJump = outBufferList->mBuffers[handle->iStream[0]].mNumberChannels;

/* You may need to deal with non-interleave and channel offset situations. Evaluate this need in coreAudio. */
for ( int k = 0; k < info.channels; k++ ) {
info.inOffset.push_back( k );
info.outOffset.push_back( k );
}

/* Clears the entire buffer to fill only existing values. */
memset(outBufferList->mBuffers[handle->iStream[0]].mData, 0, outBufferList->mBuffers[handle->iStream[0]].mDataByteSize);

convertBuffer((char*)outBufferList->mBuffers[handle->iStream[0]].mData, stream_.userBuffer[0], info);
}
}
}
else { // fill multiple streams
Expand Down Expand Up @@ -2345,9 +2380,41 @@ bool RtApiCore :: callbackEvent( AudioDeviceID deviceId,
stream_.convertInfo[1] );
}
else { // copy to user buffer
memcpy( stream_.userBuffer[1],
inBufferList->mBuffers[handle->iStream[1]].mData,
inBufferList->mBuffers[handle->iStream[1]].mDataByteSize );

/* !!! Fix Buffer Overflow when device numchannel changes !!!

macOS can change a device's configuration during use. This can be observed, for example,
in the situation where a phone call is answered in macOS. When this situation occurs, it
is likely that the number of channels in the capture device is increased, causing an
increase in the buffer size and consequently a buffer overflow in the copying process.

!!! */

/* If the number of channels in coreaudio buffer is the same as the number of channels in user buffer, proceed with the copy normally. */
if (inBufferList->mBuffers[handle->iStream[1]].mNumberChannels == stream_.nUserChannels[1] &&
inBufferList->mBuffers[handle->iStream[1]].mDataByteSize == stream_.bufferSize * stream_.nUserChannels[1] * formatBytes( stream_.userFormat )) {
memcpy( stream_.userBuffer[1], inBufferList->mBuffers[handle->iStream[1]].mData, inBufferList->mBuffers[handle->iStream[1]].mDataByteSize );
}
else {
ConvertInfo info;

/* Assuming that if there is no conversion it is because the device and user formats are the same. */
info.channels = stream_.nUserChannels[1];
info.inFormat = stream_.userFormat;
info.outFormat = stream_.userFormat;
info.inJump = inBufferList->mBuffers[handle->iStream[1]].mNumberChannels;
info.outJump = stream_.nUserChannels[1];

/* You may need to deal with non-interleave and channel offset situations. Evaluate this need in coreAudio. */
for ( int k = 0; k < info.channels; k++ ) {
info.inOffset.push_back( k );
info.outOffset.push_back( k );
}

/* No need to clear buffer. */

convertBuffer(stream_.userBuffer[1], (char*)inBufferList->mBuffers[handle->iStream[1]].mData, info);
}
}
}
else { // read from multiple streams
Expand Down