SEI CERT C Coding Standard

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changes.mady.by.user Anirban Gangopadhyay

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changes.mady.by.user Francesco Mariani

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Recommendation

Severity

Likelihood

Detectable

RepairableRemediation Cost

Priority

Level

MSC07-C

Low

Unlikely

No

YesMedium

P2

L3

Automated Detection

and

Dead code

Missing case for switch condition

Unreachable code

MISRA C:2012 Rule 2.1

A project shall not contain unreachable code

1501,1503,2008,2880,2881,2882,2883,2877,3196,

3202,3203,3205,3206,3207,3210,3219,3229,3404,

3422,3423,3425,3470,2980,2981,2982,2983,2984,2985,2986

Tool

Version

Checker

Description

Astrée
Include Page
Astrée_V
Astrée_V
dead-assignemnt
dead-initializer		Partially checked and soundly supported.
CodeSonar
Include Page
CodeSonar_V
CodeSonar_V

DIAG.UNEX.*
LANG.STRUCT.RC
LANG.STRUCT.UC

Code not exercised by analysis
Redundant condition
Unreachable {Call, Computation, Conditional, Control Flow, Data Flow}

Coverity

Include Page
Coverity_V
Coverity_V

DEADCODE


UNREACHABLE

Can detect the specific instance where code can never be reached because of a logical contradiction or a dead "default" in switch statement

Can detect the instances where code block is unreachable because of the syntactic structure of the code

GCC
Include Page
GCC_V
GCC_V


Can detect violations of this recommendation when the -Wunreachable-code flag is used

Helix QAC

Include Page
Helix QAC_V
Helix QAC_V

C1501, C1503, C2008, C2877, C2880, C2881, C2882, C2883,C3202, C3203, C3205, C3206, C3207, C3210, C3219, C3229, C3404, C3422, C3423, C3425, C3470

DF2877, DF2880, DF2881, DF2882, DF2883, DF2980, DF2981, DF2982, DF2983, DF2984, DF2985, DF2986


Klocwork
Include Page
Klocwork_V
Klocwork_V

LA_UNUSED
UNREACH.GEN
UNREACH.RETURN
UNREACH.SIZEOF

UNREACH.ENUM
INVARIANT_CONDITION.UNREACH


LDRA tool suite
Include Page
LDRA_V
LDRA_V

1 J
139 S
140 S

Fully implemented

Parasoft C/C++test
Include Page
Parasoft_V
Parasoft_V

CERT_C-MSC07-a
CERT_C-MSC07-b
CERT_C-MSC07-c
CERT_C-MSC07-d
CERT_C-MSC07-e
CERT_C-MSC07-f
CERT_C-MSC07-g
CERT_C-MSC07-h
CERT_C-MSC07-i

There shall be no unreachable code in "else" block
There shall be no unreachable code after 'return', 'break', 'continue',

'goto', 'throw' statements, and after calls to functions with the 'noreturn' attribute
There shall be no unreachable code in "if/else/while/for" block
There shall be no unreachable code in switch statement
There shall be no unreachable code in 'for' loop
There shall be no unreachable code after 'if' or 'switch' statement
There shall be no unreachable code after "if" or "switch" statement inside while/for/do...while loop
Avoid switch with unreachable branches
Avoid unreachable methods

Polyspace Bug Finder

Include Page
Polyspace Bug Finder_V
Polyspace Bug Finder_V

CERT C: Rule MSC07-C


Checks for:

  • Code does not execute
  • Default case is missing and may be reached
  • Code following control-flow statements
PRQA QA-C
Include Page
PRQA QA-C_vPRQA QA-C_v


RuleChecker
Include Page
RuleChecker_V
RuleChecker_V

dead-assignemnt
dead-initializer

Partially checked
Security Reviewer - Static Reviewer

Include Page
Security Reviewer - Static Reviewer_V
Security Reviewer - Static Reviewer_V

CPP_57
CPP_58
CPP_59
CPP_60
CPP_61
CPP_62
CPP_uninitvar
CPPCrypt
CPPDSLHardcoded
CPPDSLRAND
CPPDSLWES
CpPED
CPPEnterCriticalSection
CPPIsBadWritePtr
CPPLoadLibrary
CPPLoop

Fully implemented
SonarQube C/C++ Plugin
 
Include Page
SonarQube C/C++ Plugin_V
SonarQube C/C++ Plugin_V

S1763, S1751


Splint
Include Page
Splint_V
Splint_V


Can detect violations of this recommendation when the -Wunreachable-code flag is used

Related Vulnerabilities

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

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