Fixed #7209 (False positive: Array index used before limits check reported in sizeof)

lib/checkbufferoverrun.cpp

@@ -1803,6 +1803,11 @@ void CheckBufferOverrun::arrayIndexThenCheck()
     for (std::size_t i = 0; i < functions; ++i) {
         const Scope * const scope = symbolDatabase->functionScopes[i];
         for (const Token *tok = scope->classStart; tok && tok != scope->classEnd; tok = tok->next()) {
+            if (Token::simpleMatch(tok, "sizeof (")) {
+                tok = tok->linkAt(1);
+                continue;
+            }
+
             if (Token::Match(tok, "%name% [ %var% ]")) {
                 tok = tok->tokAt(2);
 

test/testbufferoverrun.cpp

@@ -3801,6 +3801,11 @@ private:
               "    }\n"
               "}");
         TODO_ASSERT_EQUALS("[test.cpp:2]: (style) Array index 'i' is used before limits check.\n", "", errout.str());
+
+        check("void f(int i) {\n" // sizeof
+              "  sizeof(a)/sizeof(a[i]) && i < 10;\n"
+              "}");
+        ASSERT_EQUALS("", errout.str());
     }
 
     void bufferNotZeroTerminated() {