Address in Register (air) Error

Problem: A possible memory leak. An allocated block has not been freed, and no reference to the block exists anywhere in program memory, but a reference exists in a register.

Possible causes: This can occur legitimately if the compiler keeps a program variable only in a register instead of in memory. The compiler often does this for local variables and function parameters when optimization is turned on. If this error occurs when optimization has not been turned on, it is likely to be an actual memory leak. This can occur if the only pointer to an allocated block goes out of scope before the block is freed.

Example:

if (i == 0) {
       char *ptr = (char *)malloc(4);
       /* ptr is going out of scope */
}
  /* Memory Leak or Address in Register */