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CodeSonar® 9.2p0 CONFIDENTIAL CodeSecure Inc
C and C++


LANG.TYPE.SAP : sizeof Array Parameter

要旨

The operand to sizeof() is a function parameter that is declared as an array.

A function parameter declared as an array of type T degenerates to a pointer to T. The result of applying sizeof() to such a parameter is therefore the size of the pointer, rather than the size of the entire array.

プロパティ

クラス名 sizeof Array Parameter
日本語クラス名 sizeof Array Parameter
クラス分類 信頼性 (reliability)
ニーモニック LANG.TYPE.SAP
カテゴリー
MisraC2025 MisraC2025:12.5 The sizeof operator shall not have an operand which is a function parameter declared as "array of type"
MisraC2023 MisraC2023:12.5 The sizeof operator shall not have an operand which is a function parameter declared as "array of type"
Misra2012 Misra2012:12.5 The sizeof operator shall not have an operand which is a function parameter declared as "array of type"
CWE CWE:467 Use of sizeof() on a Pointer Type
TS17961 TS17961:5.37-sizeofptr Taking the size of a pointer to determine the size of the pointed-to type
CERT-C CERT-C:ARR01-C Do not apply the sizeof operator to a pointer when taking the size of an array
対応言語 C および C++ で利用可能です。
有効/無効設定 このワーニングクラスのチェックはデフォルトで無効になっており、プロジェクトには非正規の C向けAST が必要になります。有効にするにはプロジェクト設定ファイル (configuration file) に以下の WARNING_FILTER ルールと RETAIN_UNNORMALIZED_C_AST 設定を追加してください。
RETAIN_UNNORMALIZED_C_AST = Yes
WARNING_FILTER += allow class="sizeof Array Parameter"
注:非正規化された AST を継続して使用した場合、使用ディスク容量が増加し解析時間が長くなる可能性があります。

int global_array[] = {1, 2, 3};

int lang_type_sap(int a[5], int b){
    int rv = 0;
    int local_array[] = {6, 7, 8};

    rv += sizeof(a);           /* 'sizeof Array Parameter' warning issued here
                                * - because of array parameter degeneration,
                                *   sizeof(a) == sizeof(int*)
                                *   (not 5*sizeof(int)).
                                */
    rv += sizeof(global_array);            /* ok: global_array is a global,
                                            * not a parameter of lang_type_sap(),
                                            * so this is the size of the entire array.
                                            */
    rv += sizeof(local_array);             /* ok: local_array is a local,
                                            * not a parameter of lang_type_sap(),
                                            * so this is the size of the entire array.
                                            */
    rv += sizeof(b);                       /* ok: b is a parameter of lang_type_sap()
                                            * but is not declared as an array of type.
                                            */
    return rv;
}

関連のある設定ファイルパラメータ

設定ファイルの以下のパラメータがこのワーニングクラスのチェックに影響します。

 

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