CWE-563 未使用的变量
Assignment to Variable without Use
结构: Simple
Abstraction: Variant
状态: Draft
被利用可能性: unkown
基本描述
The variable's value is assigned but never used, making it a dead store.
扩展描述
After the assignment, the variable is either assigned another value or goes out of scope. It is likely that the variable is simply vestigial, but it is also possible that the unused variable points out a bug.
相关缺陷
-
cwe_Nature: ChildOf cwe_CWE_ID: 1164 cwe_View_ID: 1000 cwe_Ordinal: Primary
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cwe_Nature: ChildOf cwe_CWE_ID: 1164 cwe_View_ID: 699 cwe_Ordinal: Primary
常见的影响
| 范围 | 影响 | 注释 |
|---|---|---|
| Other | ['Quality Degradation', 'Varies by Context'] | This weakness could be an indication of a bug in the program or a deprecated variable that was not removed and is an indication of poor quality. This could lead to further bugs and the introduction of weaknesses. |
可能的缓解方案
Implementation
策略:
Remove unused variables from the code.
示例代码
例
The following code excerpt assigns to the variable r and then overwrites the value without using it.
bad C
r = getName();
r = getNewBuffer(buf);
r = getNewBuffer(buf);
分类映射
| 映射的分类名 | ImNode ID | Fit | Mapped Node Name |
|---|---|---|---|
| CERT C Secure Coding | MSC00-C | Compile cleanly at high warning levels | |
| SEI CERT Perl Coding Standard | MSC01-PL | Imprecise | Detect and remove unused variables |
| Software Fault Patterns | SFP2 | Unused Entities |
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