Merge pull request github#5565 from geoffw0/avrule79

C++: Test strdup with AV rule 79

Author: MathiasVP

cpp/ql/test/query-tests/jsf/4.10 Classes/AV Rule 79/AV Rule 79.expected

@@ -18,9 +18,10 @@
 | NoDestructor.cpp:23:3:23:20 | ... = ... | Resource n is acquired by class MyClass5 but not released anywhere in this class. |
 | PlacementNew.cpp:36:3:36:36 | ... = ... | Resource p1 is acquired by class MyTestForPlacementNew but not released anywhere in this class. |
 | SelfRegistering.cpp:25:3:25:24 | ... = ... | Resource side is acquired by class MyOwner but not released anywhere in this class. |
-| Variants.cpp:25:3:25:13 | ... = ... | Resource f is acquired by class MyClass4 but not released anywhere in this class. |
-| Variants.cpp:65:3:65:17 | ... = ... | Resource a is acquired by class MyClass6 but not released anywhere in this class. |
-| Variants.cpp:66:3:66:36 | ... = ... | Resource b is acquired by class MyClass6 but not released anywhere in this class. |
-| Variants.cpp:67:3:67:41 | ... = ... | Resource c is acquired by class MyClass6 but not released anywhere in this class. |
+| Variants.cpp:26:3:26:13 | ... = ... | Resource f is acquired by class MyClass4 but not released anywhere in this class. |
+| Variants.cpp:69:3:69:17 | ... = ... | Resource a is acquired by class MyClass6 but not released anywhere in this class. |
+| Variants.cpp:70:3:70:36 | ... = ... | Resource b is acquired by class MyClass6 but not released anywhere in this class. |
+| Variants.cpp:71:3:71:41 | ... = ... | Resource c is acquired by class MyClass6 but not released anywhere in this class. |
+| Variants.cpp:72:3:72:22 | ... = ... | Resource d is acquired by class MyClass6 but not released anywhere in this class. |
 | Wrapped.cpp:46:3:46:22 | ... = ... | Resource ptr2 is acquired by class Wrapped2 but not released anywhere in this class. |
 | Wrapped.cpp:59:3:59:22 | ... = ... | Resource ptr4 is acquired by class Wrapped2 but not released anywhere in this class. |

cpp/ql/test/query-tests/jsf/4.10 Classes/AV Rule 79/Variants.cpp

@@ -5,6 +5,7 @@ void *malloc(size_t size);
 void *calloc(size_t nmemb, size_t size);
 void *realloc(void *ptr, size_t size);
 void free(void* ptr);
+char *strdup(const char *s1);
 
 int *ID(int *x) 
 {
@@ -45,16 +46,19 @@ class MyClass5
 		a = new int[10]; // GOOD
 		b = (int *)calloc(10, sizeof(int)); // GOOD
 		c = (int *)realloc(0, 10 * sizeof(int)); // GOOD
+		d = strdup("string");
 	}
 
 	~MyClass5()
 	{
 		delete [] a;
 		free(b);
 		free(c);
+		free(d);
 	}
 
 	int *a, *b, *c;
+	char *d;
 };
 
 class MyClass6
@@ -65,13 +69,15 @@ class MyClass6
 		a = new int[10]; // BAD
 		b = (int *)calloc(10, sizeof(int)); // BAD
 		c = (int *)realloc(0, 10 * sizeof(int)); // BAD
+		d = strdup("string"); // BAD
 	}
 
 	~MyClass6()
 	{
 	}
 
 	int *a, *b, *c;
+	char *d;
 };
 
 class MyClass7