Hi,
I want to do the following however not sure what the correct way to do
would be. I'd be grateful if you can give suggestions.
Basically I'd like to trace the usage of a variable v. For instance in
the code below I'd like to check for usage of a ptr after it has been
freed. So the variable (or ptr) of interest is myptr , and statement
printf("myptr1 %d\n",*myptr); is what I am interested in , since it
uses myptr after myptr is freed.
I am wondering if I need to calculate a CFG for the code ? or what
would the common strategies be for these purposes ? Some pseudo code
would be helpful.
Thanks in advance
// example
void f1(int *myptr1){
free(myptr1);
myptr1 = ((void *)0);
}
int main(int argc, char *argv[]){
int *myptr = (int *)malloc(sizeof(int));
*myptr1 = 10;
printf("myptr1 %d\n",*myptr); //OK , no prob
f1(myptr); //free ptr
printf("myptr1 %d\n",*myptr); //NOT-OK, deref a nullptr
return 0;
}
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