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IAR Embedded Workbench for RL78 5.20

PTR-uninit

In this section:
Synopsis

Dereference of an uninitialized or NULL pointer.

Enabled by default

Yes

Severity/Certainty

High/Medium

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Full description

An uninitialized pointer value is being dereferenced. This might cause memory corruption or an application crash. Pointer values must be initialized before being dereferenced. This check is identical to MISRAC2004-9.1_c, MISRAC++2008-8-5-1_c.

Coding standards
CERT EXP33-C

Do not reference uninitialized memory

CWE 457

Use of Uninitialized Variable

CWE 824

Access of Uninitialized Pointer

MISRA C:2004 9.1

(Required) All automatic variables shall have been assigned a value before being used.

MISRA C++ 2008 8-5-1

(Required) All variables shall have a defined value before they are used.

Code examples

The following code example fails the check and will give a warning:

void example(void) {
  int *p;
  *p = 4;  //p is uninitialized
}

The following code example passes the check and will not give a warning about this issue:

void example(void) {
  int *p,a;
  p = &a;
  *p = 4;  //OK - p holds a valid address
}