How can I correctly handle malloc failure in C, especially when there is more than one malloc?

Question

Suppose this is a part of my code:

 int foo()
 {  
    char *p, *q ;
    if((p = malloc(BUFSIZ)) == NULL) {
        return ERROR_CODE;
    }
    if((q = malloc(B         


        

Answer 1

it is matter of habit, but I prefer:

int returnFlag = FAILURE;

if ((p = malloc...) != NULL)
{
    if ((q = malloc..) != NULL)
    {
        // do some work
        returnFlag = SUCCESS; // success only if it is actually success

        free(q);
    }
    free(p);
}

return returnFlag; // all other variants are failure