From patchwork Tue May 9 09:49:38 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: James Clark X-Patchwork-Id: 680474 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 3ECE7C7EE22 for ; Tue, 9 May 2023 09:51:08 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229952AbjEIJuh (ORCPT ); Tue, 9 May 2023 05:50:37 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:60620 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233867AbjEIJuB (ORCPT ); Tue, 9 May 2023 05:50:01 -0400 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id 7997AD9; Tue, 9 May 2023 02:50:00 -0700 (PDT) Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id A8220106F; Tue, 9 May 2023 02:50:44 -0700 (PDT) Received: from e127643.arm.com (unknown [10.57.83.64]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id D40323F67D; Tue, 9 May 2023 02:49:55 -0700 (PDT) From: James Clark To: linux-kernel@vger.kernel.org, gregkh@linuxfoundation.org Cc: linux@roeck-us.net, michal.simek@amd.com, Jonathan.Cameron@huawei.com, James Clark , Jonathan Corbet , Jean Delvare , Anand Ashok Dumbre , Jonathan Cameron , Lars-Peter Clausen , Andy Gross , Bjorn Andersson , Konrad Dybcio , Jiri Slaby , linux-doc@vger.kernel.org, linux-hwmon@vger.kernel.org, linux-iio@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-arm-msm@vger.kernel.org, linux-serial@vger.kernel.org Subject: [PATCH v4 1/4] devres: Provide krealloc_array Date: Tue, 9 May 2023 10:49:38 +0100 Message-Id: <20230509094942.396150-2-james.clark@arm.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230509094942.396150-1-james.clark@arm.com> References: <20230509094942.396150-1-james.clark@arm.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-serial@vger.kernel.org There is no krealloc_array equivalent in devres. Users would have to do their own multiplication overflow check so provide one. Reviewed-by: Jonathan Cameron Signed-off-by: James Clark --- Documentation/driver-api/driver-model/devres.rst | 1 + include/linux/device.h | 11 +++++++++++ 2 files changed, 12 insertions(+) diff --git a/Documentation/driver-api/driver-model/devres.rst b/Documentation/driver-api/driver-model/devres.rst index 4249eb4239e0..8be086b3f829 100644 --- a/Documentation/driver-api/driver-model/devres.rst +++ b/Documentation/driver-api/driver-model/devres.rst @@ -364,6 +364,7 @@ MEM devm_kmalloc_array() devm_kmemdup() devm_krealloc() + devm_krealloc_array() devm_kstrdup() devm_kstrdup_const() devm_kvasprintf() diff --git a/include/linux/device.h b/include/linux/device.h index 472dd24d4823..58f4f5948edb 100644 --- a/include/linux/device.h +++ b/include/linux/device.h @@ -223,6 +223,17 @@ static inline void *devm_kcalloc(struct device *dev, { return devm_kmalloc_array(dev, n, size, flags | __GFP_ZERO); } +static inline __realloc_size(3, 4) void * __must_check +devm_krealloc_array(struct device *dev, void *p, size_t new_n, size_t new_size, gfp_t flags) +{ + size_t bytes; + + if (unlikely(check_mul_overflow(new_n, new_size, &bytes))) + return NULL; + + return devm_krealloc(dev, p, bytes, flags); +} + void devm_kfree(struct device *dev, const void *p); char *devm_kstrdup(struct device *dev, const char *s, gfp_t gfp) __malloc; const char *devm_kstrdup_const(struct device *dev, const char *s, gfp_t gfp);