asan: enable more asan and ubsan checks. (open-telemetry#224)

* Don't call nullptr->f().
* Avoid signed overflow.

.bazelrc

@@ -5,9 +5,13 @@
 build --copt -DGRPC_BAZEL_BUILD
 
 # --config=asan : Address Sanitizer.
-common:asan --copt -fsanitize=address
 common:asan --copt -DADDRESS_SANITIZER
-common:asan --linkopt -fsanitize=address
+common:asan --copt -fsanitize=address,bool,float-cast-overflow,integer-divide-by-zero,null,return,returns-nonnull-attribute,shift-exponent,signed-integer-overflow,unreachable,vla-bound
+common:asan --copt -fsanitize-address-use-after-scope
+common:asan --copt -fno-sanitize-recover=all
+common:asan --linkopt -fsanitize=address,bool,float-cast-overflow,integer-divide-by-zero,null,return,returns-nonnull-attribute,shift-exponent,signed-integer-overflow,unreachable,vla-bound
+common:asan --linkopt -fsanitize-address-use-after-scope
+common:asan --linkopt -fno-sanitize-recover=all
 common:asan --cc_output_directory_tag=asan
 
 # --config=tsan : Thread Sanitizer.

api/test/nostd/shared_ptr_test.cc

@@ -125,7 +125,7 @@ TEST(SharedPtrTest, PointerOperators)
 
   EXPECT_EQ(&*ptr1, value);
   EXPECT_EQ(
-      shared_ptr<B> {}->f(), 123);
+      shared_ptr<B> { new B }->f(), 123);
 }
 
 TEST(SharedPtrTest, Swap)

api/test/nostd/unique_ptr_test.cc

@@ -89,6 +89,9 @@ TEST(UniquePtrTest, StdUniquePtrConversionOperator)
   EXPECT_EQ(ptr1.get(), nullptr);
   EXPECT_EQ(ptr2.get(), value);
 
+  ptr2 = nullptr;
+  EXPECT_EQ(ptr2.get(), nullptr);
+
   EXPECT_TRUE((std::is_assignable<std::unique_ptr<int>, unique_ptr<int> &&>::value));
   EXPECT_FALSE((std::is_assignable<std::unique_ptr<int>, unique_ptr<int> &>::value));
 }
@@ -109,7 +112,7 @@ TEST(UniquePtrTest, PointerOperators)
 
   EXPECT_EQ(&*ptr1, value);
   EXPECT_EQ(
-      unique_ptr<B> {}->f(), 123);
+      unique_ptr<B> { new B }->f(), 123);
 }
 
 TEST(UniquePtrTest, Reset)

sdk/test/metrics/counter_aggregator_test.cc

@@ -37,7 +37,7 @@ TEST(CounterAggregator, Update)
   int sum = 0;
   for (int i = 0; i < 100; i++)
   {
-    int tmp = std::rand();
+    int tmp = std::rand() % 128;
     beta.update(tmp);
     sum += tmp;
   }