Turn on -Wconversion in some tests, shell, jsontlv.

src/inet/BasicPacketFilters.h

@@ -42,7 +42,7 @@ class DropIfTooManyQueuedPacketsFilter : public chip::Inet::EndpointQueueFilter
      *
      * @param maxAllowedQueuedPackets - max number of pending-in-queue not yet processed predicate-matching packets
      */
-    DropIfTooManyQueuedPacketsFilter(size_t maxAllowedQueuedPackets) : mMaxAllowedQueuedPackets(maxAllowedQueuedPackets) {}
+    DropIfTooManyQueuedPacketsFilter(int maxAllowedQueuedPackets) : mMaxAllowedQueuedPackets(maxAllowedQueuedPackets) {}
 
     /**
      * @brief Set the predicate to use for filtering

src/inet/tests/BUILD.gn

@@ -92,4 +92,6 @@ chip_test_suite("tests") {
     # TODO: This test does not seem executed
     sources += [ "TestLwIPDNS.cpp" ]
   }
+
+  cflags = [ "-Wconversion" ]
 }

src/inet/tests/TestBasicPacketFilters.cpp

@@ -38,7 +38,7 @@ using namespace chip::Inet;
 class DropIfTooManyQueuedPacketsHarness : public DropIfTooManyQueuedPacketsFilter
 {
 public:
-    DropIfTooManyQueuedPacketsHarness(size_t maxAllowedQueuedPackets) : DropIfTooManyQueuedPacketsFilter(maxAllowedQueuedPackets) {}
+    DropIfTooManyQueuedPacketsHarness(int maxAllowedQueuedPackets) : DropIfTooManyQueuedPacketsFilter(maxAllowedQueuedPackets) {}
 
     void OnDropped(const void * endpoint, const IPPacketInfo & pktInfo,
                    const chip::System::PacketBufferHandle & pktPayload) override

src/inet/tests/TestInetAddress.cpp

@@ -1492,10 +1492,13 @@ void CheckMakeULA(nlTestSuite * inSuite, void * inContext)
         // Call MakeULA function that we test.
         test_addr = IPAddress::MakeULA(lCurrent->global, lCurrent->subnet, lCurrent->interface);
 
-        NL_TEST_ASSERT(inSuite, test_addr.Addr[0] == htonl(ULA_PREFIX | (lCurrent->global & ULA_UP_24_BIT_MASK) >> 16));
-        NL_TEST_ASSERT(inSuite, test_addr.Addr[1] == htonl((lCurrent->global & ULA_LO_16_BIT_MASK) << 16 | lCurrent->subnet));
-        NL_TEST_ASSERT(inSuite, test_addr.Addr[2] == htonl(lCurrent->interface >> 32));
-        NL_TEST_ASSERT(inSuite, test_addr.Addr[3] == htonl(lCurrent->interface));
+        NL_TEST_ASSERT(
+            inSuite, test_addr.Addr[0] == htonl(static_cast<uint32_t>(ULA_PREFIX | (lCurrent->global & ULA_UP_24_BIT_MASK) >> 16)));
+        NL_TEST_ASSERT(inSuite,
+                       test_addr.Addr[1] ==
+                           htonl(static_cast<uint32_t>((lCurrent->global & ULA_LO_16_BIT_MASK) << 16 | lCurrent->subnet)));
+        NL_TEST_ASSERT(inSuite, test_addr.Addr[2] == htonl(static_cast<uint32_t>(lCurrent->interface >> 32)));
+        NL_TEST_ASSERT(inSuite, test_addr.Addr[3] == htonl(static_cast<uint32_t>(lCurrent->interface)));
 
         ++lCurrent;
     }
@@ -1519,8 +1522,8 @@ void CheckMakeLLA(nlTestSuite * inSuite, void * inContext)
 
         NL_TEST_ASSERT(inSuite, test_addr.Addr[0] == htonl(LLA_PREFIX));
         NL_TEST_ASSERT(inSuite, test_addr.Addr[1] == 0);
-        NL_TEST_ASSERT(inSuite, test_addr.Addr[2] == htonl(lCurrent->interface >> 32));
-        NL_TEST_ASSERT(inSuite, test_addr.Addr[3] == htonl(lCurrent->interface));
+        NL_TEST_ASSERT(inSuite, test_addr.Addr[2] == htonl(static_cast<uint32_t>(lCurrent->interface >> 32)));
+        NL_TEST_ASSERT(inSuite, test_addr.Addr[3] == htonl(static_cast<uint32_t>(lCurrent->interface)));
 
         ++lCurrent;
     }
@@ -1698,7 +1701,7 @@ void CheckIPPrefix(nlTestSuite * inSuite, void * inContext)
         SetupIPAddress(test_addr_1, lCurrent);
 
         ipprefix_1.IPAddr = test_addr_1;
-        ipprefix_1.Length = 128 - (i++ % 128);
+        ipprefix_1.Length = static_cast<uint8_t>(128 - (i++ % 128));
         ipprefix_2        = ipprefix_1;
 
         NL_TEST_ASSERT(inSuite, !ipprefix_1.IsZero());

src/lib/asn1/tests/BUILD.gn

@@ -30,4 +30,6 @@ chip_test_suite("tests") {
     "${chip_root}/src/platform",
     "${nlunit_test_root}:nlunit-test",
   ]
+
+  cflags = [ "-Wconversion" ]
 }

src/lib/asn1/tests/TestASN1.cpp

@@ -134,8 +134,10 @@ static CHIP_ERROR EncodeASN1TestData(ASN1Writer & writer)
         ASN1_ENCODE_OCTET_STRING(kTestVal_20_OctetString, 1);
         ASN1_ENCODE_OCTET_STRING(kTestVal_20_OctetString, 0);
         ASN1_ENCODE_STRING(kASN1UniversalTag_GeneralString, "", 0);
-        ASN1_ENCODE_STRING(kASN1UniversalTag_PrintableString, kTestVal_21_PrintableString, strlen(kTestVal_21_PrintableString));
-        ASN1_ENCODE_STRING(kASN1UniversalTag_UTF8String, kTestVal_22_UTFString, strlen(kTestVal_22_UTFString));
+        ASN1_ENCODE_STRING(kASN1UniversalTag_PrintableString, kTestVal_21_PrintableString,
+                           static_cast<uint16_t>(strlen(kTestVal_21_PrintableString)));
+        ASN1_ENCODE_STRING(kASN1UniversalTag_UTF8String, kTestVal_22_UTFString,
+                           static_cast<uint16_t>(strlen(kTestVal_22_UTFString)));
         ASN1_START_OCTET_STRING_ENCAPSULATED
         {
             ASN1_START_SEQUENCE
@@ -159,7 +161,7 @@ static void TestASN1_Encode(nlTestSuite * inSuite, void * inContext)
     CHIP_ERROR err;
     static uint8_t buf[2048];
     ASN1Writer writer;
-    uint16_t encodedLen;
+    size_t encodedLen;
 
     writer.Init(buf);
 
@@ -290,7 +292,7 @@ static void TestASN1_NullWriter(nlTestSuite * inSuite, void * inContext)
 {
     CHIP_ERROR err;
     ASN1Writer writer;
-    uint16_t encodedLen;
+    size_t encodedLen;
 
     writer.InitNullWriter();
 
@@ -380,7 +382,7 @@ static void TestASN1_ObjectID(nlTestSuite * inSuite, void * inContext)
     static uint8_t buf[2048];
     ASN1Writer writer;
     ASN1Reader reader;
-    uint16_t encodedLen;
+    size_t encodedLen;
 
     writer.Init(buf, sizeof(buf));
 
@@ -486,7 +488,8 @@ static void TestASN1_FromTLVReader(nlTestSuite * inSuite, void * inContext)
         ASN1_ENCODE_BIT_STRING(kTestVal_09_BitString);
 
         err = writer.PutValue(kASN1TagClass_Universal, kASN1UniversalTag_PrintableString, false,
-                              reinterpret_cast<const uint8_t *>(kTestVal_21_PrintableString), strlen(kTestVal_21_PrintableString));
+                              reinterpret_cast<const uint8_t *>(kTestVal_21_PrintableString),
+                              static_cast<uint16_t>(strlen(kTestVal_21_PrintableString)));
         NL_TEST_ASSERT(inSuite, err == CHIP_NO_ERROR);
     }
     ASN1_END_SEQUENCE;

src/lib/shell/commands/BUILD.gn

@@ -69,4 +69,6 @@ source_set("commands") {
   if (chip_device_platform != "none") {
     public_deps += [ "${chip_root}/src/app/server" ]
   }
+
+  cflags = [ "-Wconversion" ]
 }

src/lib/shell/commands/Base64.cpp

@@ -49,9 +49,13 @@ static CHIP_ERROR Base64DecodeHandler(int argc, char ** argv)
     uint8_t binary[256];
 
     VerifyOrReturnError(argc > 0, CHIP_ERROR_INVALID_ARGUMENT);
-    binarySize = Base64Decode(argv[0], strlen(argv[0]), binary);
+    auto argLen = strlen(argv[0]);
+    VerifyOrReturnError(CanCastTo<uint16_t>(argLen), CHIP_ERROR_INVALID_ARGUMENT);
+    VerifyOrReturnError(BASE64_MAX_DECODED_LEN(argLen) <= sizeof(binary), CHIP_ERROR_INVALID_ARGUMENT);
+
+    binarySize = Base64Decode(argv[0], static_cast<uint16_t>(argLen), binary);
     VerifyOrReturnError(binarySize != UINT16_MAX, CHIP_ERROR_INVALID_ARGUMENT);
-    streamer_print_hex(sout, binary, binarySize);
+    streamer_print_hex(sout, binary, static_cast<int>(binarySize));
     streamer_printf(sout, "\r\n");
     return CHIP_NO_ERROR;
 }
@@ -65,11 +69,15 @@ static CHIP_ERROR Base64EncodeHandler(int argc, char ** argv)
 
     VerifyOrReturnError(argc > 0, CHIP_ERROR_INVALID_ARGUMENT);
 
-    size_t argLen = strlen(argv[0]);
+    auto argLen = strlen(argv[0]);
     VerifyOrReturnError(CanCastTo<uint32_t>(argLen), CHIP_ERROR_INVALID_ARGUMENT);
 
     ArgParser::ParseHexString(argv[0], static_cast<uint32_t>(argLen), binary, sizeof(binary), binarySize);
-    base64Size = Base64Encode(binary, binarySize, base64);
+    if (!CanCastTo<uint16_t>(binarySize))
+    {
+        return CHIP_ERROR_INVALID_ARGUMENT;
+    }
+    base64Size = Base64Encode(binary, static_cast<uint16_t>(binarySize), base64);
     streamer_printf(sout, "%.*s\r\n", base64Size, base64);
     return CHIP_NO_ERROR;
 }

src/lib/shell/commands/Config.cpp

@@ -23,6 +23,7 @@
 #include <lib/support/CHIPArgParser.hpp>
 #include <lib/support/CHIPMem.h>
 #include <lib/support/CodeUtils.h>
+#include <lib/support/SafeInt.h>
 #include <platform/CHIPDeviceLayer.h>
 #include <platform/CommissionableDataProvider.h>
 #include <platform/DeviceInstanceInfoProvider.h>
@@ -133,8 +134,13 @@ static CHIP_ERROR ConfigGetSetupDiscriminator(bool printHeader)
 static CHIP_ERROR ConfigSetSetupDiscriminator(char * argv)
 {
     CHIP_ERROR error;
-    streamer_t * sout           = streamer_get();
-    uint16_t setupDiscriminator = strtoull(argv, nullptr, 10);
+    streamer_t * sout      = streamer_get();
+    unsigned long long arg = strtoull(argv, nullptr, 10);
+    if (!CanCastTo<uint16_t>(arg))
+    {
+        return CHIP_ERROR_INVALID_ARGUMENT;
+    }
+    uint16_t setupDiscriminator = static_cast<uint16_t>(arg);
 
     VerifyOrReturnError(setupDiscriminator != 0 && setupDiscriminator < chip::kMaxDiscriminatorValue, CHIP_ERROR_INVALID_ARGUMENT);
 

src/lib/support/jsontlv/BUILD.gn

@@ -27,4 +27,6 @@ static_library("jsontlv") {
     "${chip_root}/src/lib/core",
     jsoncpp_root,
   ]
+
+  cflags = [ "-Wconversion" ]
 }

src/lib/support/jsontlv/TlvJson.cpp

@@ -156,7 +156,7 @@ CHIP_ERROR TlvToJson(TLV::TLVReader & reader, KeyContext context, Json::Value &
         byteString.Alloc(kBase64HeaderLen + BASE64_ENCODED_LEN(span.size()) + 1);
         VerifyOrReturnError(byteString.Get() != nullptr, CHIP_ERROR_NO_MEMORY);
 
-        auto encodedLen = Base64Encode(span.data(), span.size(), byteString.Get() + kBase64HeaderLen);
+        auto encodedLen = Base64Encode(span.data(), static_cast<uint16_t>(span.size()), byteString.Get() + kBase64HeaderLen);
         if (encodedLen)
         {
             memcpy(byteString.Get(), kBase64Header, kBase64HeaderLen);