Fix audio channel allocation issue on ALSA/linux

modules/juce_audio_devices/native/juce_linux_ALSA.cpp

@@ -486,14 +486,17 @@ public:
         sampleRate = newSampleRate;
         bufferSize = newBufferSize;
 
-        inputChannelBuffer.setSize (jmax ((int) minChansIn, inputChannels.getHighestBit()) + 1, bufferSize);
+        int maxInputsRequested = inputChannels.getHighestBit() + 1;
+        maxInputsRequested = jmax ((int) minChansIn, jmin ((int) maxChansIn, maxInputsRequested));
+
+        inputChannelBuffer.setSize (maxInputsRequested, bufferSize);
         inputChannelBuffer.clear();
         inputChannelDataForCallback.clear();
         currentInputChans.clear();
 
         if (inputChannels.getHighestBit() >= 0)
         {
-            for (int i = 0; i <= jmax (inputChannels.getHighestBit(), (int) minChansIn); ++i)
+            for (int i = 0; i < maxInputsRequested; ++i)
             {
                 if (inputChannels[i])
                 {
@@ -505,14 +508,17 @@ public:
 
         ensureMinimumNumBitsSet (outputChannels, (int) minChansOut);
 
-        outputChannelBuffer.setSize (jmax ((int) minChansOut, outputChannels.getHighestBit()) + 1, bufferSize);
+        int maxOutputsRequested = outputChannels.getHighestBit() + 1;
+        maxOutputsRequested = jmax ((int) minChansOut, jmin ((int) maxChansOut, maxOutputsRequested));
+
+        outputChannelBuffer.setSize (maxOutputsRequested, bufferSize);
         outputChannelBuffer.clear();
         outputChannelDataForCallback.clear();
         currentOutputChans.clear();
 
         if (outputChannels.getHighestBit() >= 0)
         {
-            for (int i = 0; i <= jmax (outputChannels.getHighestBit(), (int) minChansOut); ++i)
+            for (int i = 0; i < maxOutputsRequested; ++i)
             {
                 if (outputChannels[i])
                 {