tier1: fix possible unsafe read in lzss SafeUncompress, make tests pass under asan

unittests/tier1test/lzsstest.cpp

@@ -0,0 +1,78 @@
+#include "tier0/dbg.h"
+#include "unitlib/unitlib.h"
+#include "tier1/lzss.h"
+
+#ifdef USING_ASAN
+#include <sanitizer/asan_interface.h>
+#endif
+
+DEFINE_TESTSUITE( LZSSSafeUncompressTestSuite )
+
+static void SafeUncompressTests()
+{
+	CLZSS lzss;
+	char poision1[8192];
+	unsigned char in[256];
+
+	char poision2[8192];
+
+	unsigned char out[256];
+	char poision3[8192];
+
+#ifdef USING_ASAN
+	ASAN_POISON_MEMORY_REGION( poision1, 8192 );
+	ASAN_POISON_MEMORY_REGION( poision2, 8192 );
+	ASAN_POISON_MEMORY_REGION( poision3, 8192 );
+#endif
+
+	lzss_header_t *pHeader = (lzss_header_t*)in;
+	pHeader->actualSize = sizeof(in)-sizeof(lzss_header_t);
+	pHeader->id = LZSS_ID;
+
+	uint result = 0;
+
+	// 0xff bytes test
+	memset(in+8, 0xFF, sizeof(in)-sizeof(lzss_header_t));
+	result = lzss.SafeUncompress( in, sizeof(in), out, sizeof(out) );
+	Shipping_Assert( result == 0 );
+
+	// zero bytes test
+	memset(in+8, 0x0, sizeof(in)-sizeof(lzss_header_t));
+	result = lzss.SafeUncompress( in, sizeof(in), out, sizeof(out) );
+	Shipping_Assert( result == 0 );
+
+	// valid data, invalid header
+	pHeader->actualSize = 1;
+	pHeader->id = LZSS_ID;
+	result = lzss.SafeUncompress( in, sizeof(in), out, sizeof(out) );
+	Shipping_Assert( result == 0 );
+
+	pHeader->actualSize = 999;
+	pHeader->id = LZSS_ID;
+	result = lzss.SafeUncompress( in, sizeof(in), out, sizeof(out) );
+	Shipping_Assert( result == 0 );
+
+	pHeader->actualSize = 999;
+	pHeader->id = 1337;
+	result = lzss.SafeUncompress( in, sizeof(in), out, sizeof(out) );
+	Shipping_Assert( result == 0 );
+
+
+	// valid header, valid data
+	const unsigned char compressed[] = {0x4c,0x5a,0x53,0x53,0x1a,0x0,0x0,0x0,0x0,0x44,0x6f,0x20,0x79,0x6f,0x75,0x20,0x6c,0x0,0x69,0x6b,0x65,0x20,0x77,0x68,0x61,0x74,0x41,0x0,0xd4,0x73,0x65,0x65,0x3f,0x0,0x0,0x0};
+
+	pHeader->actualSize = sizeof(compressed);
+	pHeader->id = LZSS_ID;
+	result = lzss.SafeUncompress( compressed, sizeof(compressed), out, sizeof(out) );
+
+	const char data[] = "Do you like what you see?";
+	Shipping_Assert( memcmp(out, data, 26) == 0 );
+	Shipping_Assert( result == 26 );
+}
+
+DEFINE_TESTCASE( LZSSSafeUncompressTest, LZSSSafeUncompressTestSuite )
+{
+	Msg( "Running CLZSS::SafeUncompress tests\n" );
+
+	SafeUncompressTests();
+}

unittests/tier1test/wscript

@@ -14,7 +14,7 @@ def configure(conf):
 	conf.define('TIER1TEST_EXPORTS', 1)
 
 def build(bld):
-	source = ['commandbuffertest.cpp', 'utlstringtest.cpp', 'tier1test.cpp'] #, 'lzsstest.cpp']
+	source = ['commandbuffertest.cpp', 'utlstringtest.cpp', 'tier1test.cpp', 'lzsstest.cpp']
 	includes = ['../../public', '../../public/tier0']
 	defines = []
 	libs = ['tier0', 'tier1', 'mathlib', 'unitlib']