From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id E82D01BC4E; Mon, 27 Oct 2025 19:25:12 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1761593113; cv=none; b=GR2lH7MTJ+zTuZDx5AnQKuHNfQZu6Py3KoDlWXaJgGlzu8mq3FMxM60p2ZoJCC87mYK6o010+jO6UaaWugvsEMuzrABi/MFamm0XnZTyeSmnvcslZBWuIRc8ujyVDm99vu9PQsnNYEzv77r6NQSUSXl0sYpSzOP4tY0+tlCywHE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1761593113; c=relaxed/simple; bh=UFji515DdRn7XtDgMWKDitQbmqJ6wgquUnXhiFHU/AA=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=BVwJL4xt69X0lH/P9Gqg+KvMLaisypB8gH2kWaWWMa+r2AwLqJqUgP28ZZrZsak8HI6bj9fdf5zT3h5942RV4PonKb/qhm/+OqY2bpzHgRCqcK8uQ3MpKTCzZKH8VzwBOHunfRBmhnRg8gzFg4Ng7NQyNrAkuhhqKMuxCfeKPzU= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=VMU2XV6a; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="VMU2XV6a" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 7961CC4CEF1; Mon, 27 Oct 2025 19:25:12 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1761593112; bh=UFji515DdRn7XtDgMWKDitQbmqJ6wgquUnXhiFHU/AA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=VMU2XV6aeWhyy3Adg5vne7IRPUvoG/3NyDJ8rnH0f/nKozcuoA4N6HFAYp57aN2kz 6pPRTT35ddr9tFQS1Jb4eA1J0naN0/yCVWLSTJ8ruBQoy19rXtIH/sz2AyvypS0/R9 K530v3cVRtnAfUuShe7IviMAqE0etn6QPAVdzE0g= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Junjie Cao , Kees Cook , Sasha Levin Subject: [PATCH 6.17 018/184] lkdtm: fortify: Fix potential NULL dereference on kmalloc failure Date: Mon, 27 Oct 2025 19:35:00 +0100 Message-ID: <20251027183515.424436909@linuxfoundation.org> X-Mailer: git-send-email 2.51.1 In-Reply-To: <20251027183514.934710872@linuxfoundation.org> References: <20251027183514.934710872@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.17-stable review patch. If anyone has any objections, please let me know. ------------------ From: Junjie Cao [ Upstream commit 01c7344e21c2140e72282d9d16d79a61f840fc20 ] Add missing NULL pointer checks after kmalloc() calls in lkdtm_FORTIFY_STR_MEMBER() and lkdtm_FORTIFY_MEM_MEMBER() functions. Signed-off-by: Junjie Cao Link: https://lore.kernel.org/r/20250814060605.5264-1-junjie.cao@intel.com Signed-off-by: Kees Cook Signed-off-by: Sasha Levin --- drivers/misc/lkdtm/fortify.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/drivers/misc/lkdtm/fortify.c b/drivers/misc/lkdtm/fortify.c index 0159276656780..00ed2147113e6 100644 --- a/drivers/misc/lkdtm/fortify.c +++ b/drivers/misc/lkdtm/fortify.c @@ -44,6 +44,9 @@ static void lkdtm_FORTIFY_STR_MEMBER(void) char *src; src = kmalloc(size, GFP_KERNEL); + if (!src) + return; + strscpy(src, "over ten bytes", size); size = strlen(src) + 1; @@ -109,6 +112,9 @@ static void lkdtm_FORTIFY_MEM_MEMBER(void) char *src; src = kmalloc(size, GFP_KERNEL); + if (!src) + return; + strscpy(src, "over ten bytes", size); size = strlen(src) + 1; -- 2.51.0