SEI CERT C Coding Standard

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Code Block
bgColor#ccccff
langc
int *p1 = foo();

/* Removable if bar() does not produce any side effects */
(void)bar();

/* Removable if baz() does not produce any side effects */
(void)baz();
return p1;

Exceptions

Anchor
MSC13-EX1
MSC13-EX1
MSC13-EX1: Initializing a variable with a default value, such as 0, which gets subsequently overwritten may be inefficient, but is less of a problem than reading an uninitialized value, as per EXP33-C. Do not read uninitialized memory.

Risk Assessment

Unused values may indicate significant logic errors.

Recommendation

Severity

Likelihood

Remediation Cost

Priority

Level

MSC13-C

Low

Unlikely

Medium

P2

L3

Automated Detection

Tool

Version

Checker

Description

Astrée
Include Page
Astrée_V
Astrée_V

Supported, but no explicit checker
CodeSonar
Include Page
CodeSonar_V
CodeSonar_V

LANG.STRUCT.UUVAL

Unused value

Coverity

Include Page
Coverity_V
Coverity_V

UNUSED_VALUE

Finds variables that are assigned pointer values returned from a function call but never used

Helix QAC

Include Page
Helix QAC_V
Helix QAC_V

C1500, C1502, C3203, C3205, C3206, C3207, C3229

DF2980, DF2981, DF2982, DF2983, DF2984, DF2985, DF2986


Klocwork
Include Page
Klocwork_V
Klocwork_V

LV_UNUSED.GEN
VA_UNUSED.GEN
VA_UNUSED.INIT

Can detect violations of this rule with a number of checkers


LDRA tool suite
Include Page
LDRA_V
LDRA_V

1 D, 8 D, 105 D, 94 D, 15 D

Fully implemented

Parasoft C/C++test
9.5MISRA2008-0_1_3_bFully implementedPolyspace Bug FinderR2016a
Include Page
Parasoft_V
Parasoft_V

CERT_C-MSC13-a

Avoid unnecessary local variables
PC-lint Plus

Include Page
PC-lint Plus_V
PC-lint Plus_V

438, 505, 529, 715, 838

Partially supported

Polyspace Bug Finder

Include Page
Polyspace Bug Finder_V
Polyspace Bug Finder_V

CERT C: Rec. MSC13-C


Checks for:

  • Unused parameter
  • Write without a further read

Function prototype has parameters not read or written in function body

Variable never read after assignment

Rec. partially covered.

PVS-Studio

Include Page
PVS-Studio_V
PVS-Studio_V

V519, V596, V603, V714, V744, V751, V763, V1001, V5003
SonarQube C/C++ Plugin
Include Page
SonarQube C/C++ Plugin_V
SonarQube C/C++ Plugin_V
S1854
PRQA QA-C Include PagePRQA QA-C_vPRQA QA-C_v

1500, 1502, 3203, 3205, 3206, 3207, 3229, 3196, 2980, 2981, 2982, 2983, 2984, 2985, 2986

Fully implemented

Related Vulnerabilities

Search for vulnerabilities resulting from the violation of this rule on the CERT website.

Related Guidelines

SEI CERT C++ Coding StandardVOID MSC13-CPP. Detect and remove unused values
ISO/IEC TR 24772Likely Incorrect Expressions [KOA]
Dead and Deactivated Code [XYQ]
Unused Variable [XYR]

Bibliography

[Coverity 2007]

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