Fix some usages of BStackOrHeapArray.

Validates the buffer with IsValid() before actually using it. Thanks Rene!

src/add-ons/kernel/busses/scsi/virtio/VirtioSCSIController.cpp

@@ -210,6 +210,11 @@ VirtioSCSIController::ExecuteRequest(scsi_ccb *ccb)
 	uint32 inCount = (isIn ? ccb->sg_count : 0) + 1;
 	uint32 outCount = (isOut ? ccb->sg_count : 0) + 1;
 	BStackOrHeapArray<physical_entry, 16> entries(inCount + outCount);
+	if (!entries.IsValid()) {
+		fRequest->SetStatus(SCSI_REQ_INVALID);
+		fRequest->Finish(false);
+		return B_NO_MEMORY;
+	}
 	fRequest->FillRequest(inCount, outCount, entries);
 
 	{

src/add-ons/kernel/network/protocols/ipv6/ipv6.cpp

@@ -638,6 +638,8 @@ send_fragments(ipv6_protocol* protocol, struct net_route* route,
 		return status;
 
 	BStackOrHeapArray<uint8, 128> data(bytesLeft);
+	if (!data.IsValid())
+		return B_NO_MEMORY;
 	status = gBufferModule->read(buffer, headersLength, data, bytesLeft);
 	if (status != B_OK)
 		return status;

src/add-ons/media/media-add-ons/mixer/MixerCore.cpp

@@ -524,6 +524,10 @@ MixerCore::_MixThread()
 	chan_info_list inputChanInfos[MAX_CHANNEL_TYPES];
 	BStackOrHeapArray<chan_info_list, 16> mixChanInfos(fMixBufferChannelCount);
 		// TODO: this does not support changing output channel count
+	if (!mixChanInfos.IsValid()) {
+		ERROR("MixerCore::_MixThread mixChanInfos allocation failed\n");
+		return;
+	}
 
 	fEventTime = timeBase;
 	int64 framePos = 0;

src/apps/soundrecorder/VUView.cpp

@@ -110,6 +110,8 @@ void
 VUView::_RenderLoop()
 {
 	BStackOrHeapArray<rgb_color[2], 64> levels(fLevelCount);
+	if (!levels.IsValid())
+		return;
 	
 	for (int32 i = 0; i < fLevelCount; i++) {
 		levels[i][0] = levels[i][1] = back_color;	

src/apps/terminal/BasicTerminalBuffer.cpp

@@ -539,6 +539,8 @@ BasicTerminalBuffer::Find(const char* _pattern, const TermPos& start,
 
 	// convert pattern to UTF8Char array
 	BStackOrHeapArray<UTF8Char, 64> pattern(patternByteLen);
+	if (!pattern.IsValid())
+		return false;
 	int32 patternLen = 0;
 	while (*_pattern != '\0') {
 		int32 charLen = UTF8Char::ByteCount(*_pattern);

src/system/libroot/os/find_directory.cpp

@@ -203,6 +203,8 @@ create_path(const char *path, mode_t mode)
 		return EINVAL;
 
 	BStackOrHeapArray<char, 128> buffer(pathLength + 1);
+	if (!buffer.IsValid())
+		return B_NO_MEMORY;
 
 	while (++i < pathLength) {
 		char *slash = strchr(&path[i], '/');