partial fix for #3063 (false negative: multi dimensional arrays not well supported)

lib/checkbufferoverrun.cpp

@@ -1146,8 +1146,25 @@ void CheckBufferOverrun::checkScope(const Token *tok, const ArrayInfo &arrayInfo
                 {
                     arrayIndexOutOfBoundsError(tok, arrayInfo, indexes);
                 }
+                // Is any array index out of bounds?
+                else if (totalIndex != totalElements)
+                {
+                    // check each index for overflow
+                    for (unsigned int i = 0; i < indexes.size(); ++i)
+                    {
+                        if (indexes[i] >= arrayInfo.num(i))
+                        {
+                            // The access is still within the memory range for the array
+                            // so it may be intentional.
+                            if (_settings->inconclusive)
+                            {
+                                arrayIndexOutOfBoundsError(tok, arrayInfo, indexes);
+                                break; // only warn about the first one
+                            }
+                        }
+                    }
+                }
             }
-
         }
 
         // Loop..

test/testbufferoverrun.cpp

@@ -109,6 +109,7 @@ private:
         TEST_CASE(array_index_31); // ticket #2120 - out of bounds in subfunction when type is unknown
         TEST_CASE(array_index_32);
         TEST_CASE(array_index_33); // ticket #3044
+        TEST_CASE(array_index_34); // ticket #3063
         TEST_CASE(array_index_multidim);
         TEST_CASE(array_index_switch_in_for);
         TEST_CASE(array_index_for_in_for);   // FP: #2634
@@ -1090,6 +1091,17 @@ private:
         ASSERT_EQUALS("", errout.str());
     }
 
+    void array_index_34() // ticket #3063
+    {
+        check("void foo() {\n"
+              "    int y[2][2][2];\n"
+              "    y[0][2][0] = 0;\n"
+              "    y[0][0][2] = 0;\n"
+              "}\n");
+        ASSERT_EQUALS("[test.cpp:3]: (error) Array 'y[2][2][2]' index y[0][2][0] out of bounds\n"
+                      "[test.cpp:4]: (error) Array 'y[2][2][2]' index y[0][0][2] out of bounds\n", errout.str());
+    }
+
     void array_index_multidim()
     {
         check("void f()\n"
@@ -1153,7 +1165,7 @@ private:
               "  char a[10][10][10];\n"
               "  a[2*3][4*3][2] = 'a';\n"
               "}\n");
-        TODO_ASSERT_EQUALS("[test.cpp:4]: (error) Array 'a[10][10][10]' index a[6][12][2] out of bounds\n", "", errout.str());
+        ASSERT_EQUALS("[test.cpp:4]: (error) Array 'a[10][10][10]' index a[6][12][2] out of bounds\n", errout.str());
 
         check("void f()\n"
               "{\n"