Add a few CWE-562 test cases

tests/regression/74-invalid_deref/30-cwe-562-nested-globals.c

@@ -0,0 +1,18 @@
+#include <stdlib.h>
+
+char **a;
+char *globb;
+
+char *cwe() {
+    globb = malloc(sizeof(char));
+    a = malloc(sizeof(char*));
+    *a = globb;
+    // TODO: Not sure why we still get a warn for the line below. Need to fix it
+    return *a; //NOWARN
+}
+
+int main(int argc, char const *argv[]) {
+    char *b = cwe();
+    char test = *b;
+    return 0;
+}

tests/regression/74-invalid_deref/31-cwe-562-address-taken.c

@@ -0,0 +1,12 @@
+#include <stdlib.h>
+
+char *cwe() {
+    char a;
+    return &a; //WARN
+}
+
+int main(int argc, char const *argv[]) {
+    char *b = cwe();
+    char test = *b; //WARN
+    return 0;
+}

tests/regression/74-invalid_deref/32-cwe-562-local-ptr-var.c

@@ -0,0 +1,12 @@
+#include <stdlib.h>
+
+char *cwe() {
+    char *a;
+    return a; //WARN
+}
+
+int main(int argc, char const *argv[]) {
+    char *b = cwe();
+    char test = *b; //WARN
+    return 0;
+}

tests/regression/74-invalid_deref/33-cwe-562-global-local.c

@@ -0,0 +1,16 @@
+#include <stdlib.h>
+
+char **a;
+
+char *cwe() {
+    char *local;
+    a = malloc(sizeof(char*));
+    *a = local;
+    return *a; //WARN
+}
+
+int main(int argc, char const *argv[]) {
+    char *b = cwe();
+    char test = *b; //WARN
+    return 0;
+}