Update travis config for fuzzer builds

.travis.yml

@@ -70,9 +70,16 @@ install:
 
 before_script:
 - mkdir -p build && cd build
-- cmake .. -G Ninja -DCMAKE_BUILD_TYPE=$BUILD_TYPE
+- if [ "$CXX" = "clang++-8"; then
+    # Build UBSan binary
+    export CXXFLAGS="-fsanitize=undefined -fsanitize-coverage=bb,trace-pc-guard";
+    cmake .. -G Ninja -DCMAKE_BUILD_TYPE=$BUILD_TYPE
     -DSNAPPY_REQUIRE_${CPU_LEVEL}=ON
-    -DSNAPPY_BUILD_FUZZERS=ON
+    -DSNAPPY_BUILD_FUZZERS=ON;
+  else
+    cmake .. -G Ninja -DCMAKE_BUILD_TYPE=$BUILD_TYPE
+    -DSNAPPY_REQUIRE_${CPU_LEVEL}=ON;
+  fi
 - cmake --build .
 - cd ..
 

snappy-compress-uncompress-fuzzer.cc

@@ -53,14 +53,14 @@ extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size)
 	assert(compressed_len == compressed_out.size());
 	assert(compressed_len <= snappy::MaxCompressedLength(input.size()));
 	assert(snappy::IsValidCompressedBuffer(
-	    compressed_out.data(),
-			compressed_out.size()));
+	  compressed_out.data(),
+	  compressed_out.size()));
 
 	size_t uncompressed_len = 0;
 	bool getcomp_len_success = snappy::GetUncompressedLength(
-	  	compressed_out.data(),
-	  	compressed_out.size(),
-	  	&uncompressed_len);
+	  compressed_out.data(),
+	  compressed_out.size(),
+	  &uncompressed_len);
 	// Check that GetUncompressedLength() does not return a very large
 	// value (1 MB) on success.
 	assert(!getcomp_len_success || uncompressed_len < (1 << 20));
@@ -68,9 +68,9 @@ extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size)
 	// Uncompress
 	string uncompressed_out;
 	bool uncompress_success = snappy::Uncompress(
-		compressed_out.data(),
-		compressed_out.size(),
-		&uncompressed_out);
+	  compressed_out.data(),
+	  compressed_out.size(),
+	  &uncompressed_out);
 
 	assert(uncompress_success);
 	assert(input == uncompressed_out);

snappy-uncompress-fuzzer.cc

@@ -45,9 +45,9 @@ extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size)
 
   size_t uncompressed_len = 0;
   bool getcomp_len_success = snappy::GetUncompressedLength(
-      input.data(),
-      input.size(),
-      &uncompressed_len);
+    input.data(),
+    input.size(),
+    &uncompressed_len);
   // Check that GetUncompressedLength() does not return a very large
   // value (1 MB) on success.
   assert(!getcomp_len_success || uncompressed_len < (1 << 20));
@@ -55,9 +55,9 @@ extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size)
   // Uncompress
   string uncompressed_out;
   bool uncompress_success = snappy::Uncompress(
-      input.data(),
-      input.size(),
-      &uncompressed_out);
+    input.data(),
+    input.size(),
+    &uncompressed_out);
 
   assert(uncompress_success);
   return 0;