Software vulnerabilities can result when a programmer fails to consider all possible data states.
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Note that adding a default case to a switch statement, even when all possible switch labels are specified, is an exception (MSC07-EX1) to MSC07-C. Detect and remove dead code.
An alternative compliant solution to the noncompliant code example is to provide a return statement after the switch statement. Note, however, that this solution may not be appropriate in all situations.
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Tool | Version | Checker | Description | ||||||
|---|---|---|---|---|---|---|---|---|---|
| 12 S | Fully implemented. | |||||||
| GCC |
| Can detect some violations of this recommendation when the | |||||||
Compass/ROSE | Can detect some violations of this recommendation. In particular, it flags switch statements that do not have a default clause. ROSE should detect "fake switches" as well (that is, a chain of if (x > 0) {
/* ... */
} else if (x < 0) {
/* ... */
} else if (x == 0) {
/* ... */
}
| ||||||||
| Klocwork |
| LA_UNUSED | |||||||
| PRQA QA-C |
| 0597 1460 1470 1472 2002 2004 | Fully implemented |
Related Vulnerabilities
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ISO/IEC TR 17961 (Draft) Use of an implied default in a switch statement [swtchdflt]
ISO/IEC TR 24772 "CLL Switch statements and static analysis"
Sources
[Hatton 1995] Section 2.7.2, "Errors of omission and addition"
[Viega 2005] Section 5.2.17, "Failure to account for default case in switch"
[http://www.aeroxp.org/2009/01/lesson-on-infinite-loops] for analysis on the Zune 30 bug
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