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Wed, 11 Oct 2023 04:16:45 -0700 From: Kartik To: , , , , , , , , , , , , , , , , , Subject: [PATCH v4 1/8] mm/util: Introduce kmemdup_array() to duplicate an array Date: Wed, 11 Oct 2023 15:04:05 +0530 Message-ID: <20231011093412.7994-2-kkartik@nvidia.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20231011093412.7994-1-kkartik@nvidia.com> References: <20231011093412.7994-1-kkartik@nvidia.com> Precedence: bulk X-Mailing-List: linux-hardening@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-NVConfidentiality: public X-NV-OnPremToCloud: ExternallySecured X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DS1PEPF00017099:EE_|CH2PR12MB4054:EE_ X-MS-Office365-Filtering-Correlation-Id: 6c4edbb4-4a7b-49f0-af2f-08dbca4b99f3 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:216.228.117.160;CTRY:US;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:mail.nvidia.com;PTR:dc6edge1.nvidia.com;CAT:NONE;SFS:(13230031)(4636009)(136003)(376002)(396003)(39860400002)(346002)(230922051799003)(82310400011)(186009)(64100799003)(451199024)(1800799009)(40470700004)(46966006)(36840700001)(83380400001)(36860700001)(47076005)(26005)(6666004)(478600001)(41300700001)(70586007)(70206006)(110136005)(1076003)(426003)(2616005)(316002)(336012)(5660300002)(8936002)(921005)(356005)(8676002)(40460700003)(7636003)(2906002)(7416002)(82740400003)(40480700001)(36756003)(86362001)(83996005)(2101003);DIR:OUT;SFP:1101; X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 11 Oct 2023 11:17:05.5892 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 6c4edbb4-4a7b-49f0-af2f-08dbca4b99f3 X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.117.160];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: DS1PEPF00017099.namprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: CH2PR12MB4054 X-Spam-Status: No, score=-1.1 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,FORGED_SPF_HELO, RCVD_IN_DNSWL_BLOCKED,RCVD_IN_MSPIKE_H2,SPF_HELO_PASS,SPF_NONE, URIBL_BLOCKED autolearn=no autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Introduce function kmemdup_array(), that will copy `n` number of elements from a given array `src` to `dst`. On success, kmemdup_array() returns 0 and copy the elements from `src` to newly allocated array `dst`, it also stores number of elements copied from `src` array to `dst_count` parameter. On failure, this returns a negative integer value containing the error value. Signed-off-by: Kartik --- include/linux/string.h | 2 ++ mm/util.c | 34 ++++++++++++++++++++++++++++++++++ 2 files changed, 36 insertions(+) diff --git a/include/linux/string.h b/include/linux/string.h index dbfc66400050..6245a7918b05 100644 --- a/include/linux/string.h +++ b/include/linux/string.h @@ -179,6 +179,8 @@ extern char *kstrndup(const char *s, size_t len, gfp_t gfp); extern void *kmemdup(const void *src, size_t len, gfp_t gfp) __realloc_size(2); extern void *kvmemdup(const void *src, size_t len, gfp_t gfp) __realloc_size(2); extern char *kmemdup_nul(const char *s, size_t len, gfp_t gfp); +extern int kmemdup_array(void **dst, size_t *dst_count, const void *src, size_t element_size, + size_t count, gfp_t gfp); extern char **argv_split(gfp_t gfp, const char *str, int *argcp); extern void argv_free(char **argv); diff --git a/mm/util.c b/mm/util.c index 6eddd891198e..a7c87a119be1 100644 --- a/mm/util.c +++ b/mm/util.c @@ -135,6 +135,40 @@ void *kmemdup(const void *src, size_t len, gfp_t gfp) } EXPORT_SYMBOL(kmemdup); +/** + * kmemdup_array - duplicate a given array. + * + * @dst: reference to the pointer to store address of duplicated array. + * @dst_count: number of elements in the duplicated array. + * @src: array to duplicate. + * @element_size: size of each element of array. + * @count: number of elements to duplicate from array. + * @gfp: GFP mask to use. + * + * Return: Returns 0 on success, on failure this returns a negative error value. + */ +int kmemdup_array(void **dst, size_t *dst_count, const void *src, size_t element_size, size_t count, + gfp_t gfp) +{ + size_t size; + + *dst_count = 0; + + if (!src || !element_size || !count) + return -EINVAL; + + size = size_mul(element_size, count); + + *dst = kmemdup(src, size, gfp); + if (*dst) + return -ENOMEM; + + *dst_count = size / element_size; + + return 0; +} +EXPORT_SYMBOL(kmemdup_array); + /** * kvmemdup - duplicate region of memory *