From mboxrd@z Thu Jan 1 00:00:00 1970 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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 87C5ED2D8F9 for ; Tue, 27 Jan 2026 11:07:38 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-ID:Date:Subject:Cc:To:From: Reply-To:Content-Type:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=nnKd7x/vUhOTzGd8FoCvZV6tIq7PhtSSkjGuWUY1hLg=; b=K+0HTMW90zyzjpwT8JRK3dJ+zG PaQHh/ZGRNg/wlogBMQqJXA32kzYMboiLFYFibrYrE2EDimu3PZxAtrSclvUk49+iNUHV2HV4D55w Bqke/ovlsQStXY5c+EMfIyhTjp4rpeOl0YUkhS/n0ZHW6JD+yJLq8/s+gMQioT7bDxkmkXLkevx4h h5eJhMamjrop9U2rE28TeSAwtUTMoHD7ugcJh6bzRA+DAbgY9+mixt+CKGbloQggie0ul440awiDO yglVbJ98jmyBs8fRZW9Vztq9vE1qmruZtLbCnTaqLy2V6cBRi0qwhbxbFGIAQEA8C6/CnkqfJb6wU +/7p/sYw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1vkguy-0000000E84P-2f6W; Tue, 27 Jan 2026 11:07:32 +0000 Received: from out-179.mta0.migadu.com ([91.218.175.179]) by bombadil.infradead.org with esmtps (Exim 4.98.2 #2 (Red Hat Linux)) id 1vkgut-0000000E828-01pU for linux-arm-kernel@lists.infradead.org; Tue, 27 Jan 2026 11:07:29 +0000 X-Report-Abuse: Please report any abuse attempt to abuse@migadu.com and include these headers. DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.dev; s=key1; t=1769512044; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=nnKd7x/vUhOTzGd8FoCvZV6tIq7PhtSSkjGuWUY1hLg=; b=GUnq+62+JIvt2L6syHkyb4wlqFvKZ+plmGGr2LRmJ31JSFcdYZe8UNoVCUIGyMGFcOMizN 7RruA3EgntlZQH9DfgsHOnbyeNw47OlNL1IA1mw0t8llsJ6P2Tsrkjh6Bl5Bwcnni4SOQn stU/B0Bq56oLlp6dehK6ekQxRRewAFs= From: Thorsten Blum To: Alexander Shishkin , Maxime Coquelin , Alexandre Torgue Cc: Thorsten Blum , linux-stm32@st-md-mailman.stormreply.com, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Subject: [PATCH RESEND 2/2] stm class: Replace kzalloc + copy_from_user with memdup_user_nul Date: Tue, 27 Jan 2026 12:06:53 +0100 Message-ID: <20260127110654.436657-2-thorsten.blum@linux.dev> In-Reply-To: <20260127110654.436657-1-thorsten.blum@linux.dev> References: <20260127110654.436657-1-thorsten.blum@linux.dev> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Migadu-Flow: FLOW_OUT X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260127_030728_368395_433275A0 X-CRM114-Status: GOOD ( 10.08 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Replace kzalloc() followed by copy_from_user() with memdup_user_nul() to simplify and improve stm_char_policy_set_ioctl(). Remove the obsolete comment. Signed-off-by: Thorsten Blum --- drivers/hwtracing/stm/core.c | 15 +++------------ 1 file changed, 3 insertions(+), 12 deletions(-) diff --git a/drivers/hwtracing/stm/core.c b/drivers/hwtracing/stm/core.c index 5834f796e86b..335bcf749214 100644 --- a/drivers/hwtracing/stm/core.c +++ b/drivers/hwtracing/stm/core.c @@ -733,18 +733,9 @@ static int stm_char_policy_set_ioctl(struct stm_file *stmf, void __user *arg) if (size < sizeof(*id) || size >= PATH_MAX + sizeof(*id)) return -EINVAL; - /* - * size + 1 to make sure the .id string at the bottom is terminated, - * which is also why memdup_user() is not useful here - */ - id = kzalloc(size + 1, GFP_KERNEL); - if (!id) - return -ENOMEM; - - if (copy_from_user(id, arg, size)) { - ret = -EFAULT; - goto err_free; - } + id = memdup_user_nul(arg, size); + if (IS_ERR(id)) + return PTR_ERR(id); if (id->__reserved_0 || id->__reserved_1) goto err_free; -- Thorsten Blum GPG: 1D60 735E 8AEF 3BE4 73B6 9D84 7336 78FD 8DFE EAD4