From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (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 89AF83FE352; Wed, 20 May 2026 18:40:43 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1779302444; cv=none; b=KZnatYSas0SNPFQq1nKabwSIbfhXX9FIeagc5JgO1xl5y41mBimvNPR28qGS/jUBv2YA0bGcFT68Vgbbg2f9QOpYwGpD3cVSE+bjy9zbV6bOp+CqUj8lc4nSPqRh5cjXBRkrPjcyEFwkKtDyU1KuG5vrzlTdgjOesqy8MCRlDOU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1779302444; c=relaxed/simple; bh=DUvAy8uZ5rvon1ZQ9YnyoVRWhmGG/cWnCMR8odBDmGI=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=XroFcpCy9ZwLfJ+/pVhSGIib7w77sOfJnTajBaD6mhaBuVKtYNtmU8MMooqmynMt2I4Ntolunjs3ZlVxpLKMjEIya1ILPtFTADjrxVopDN9hfgBW0vWqLdZUOG6JqHm8cMOuXBaUVB5IdnGAhMajL12TdulfBWVZ5+6iG3Ec2y8= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=d3UI0ZEW; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="d3UI0ZEW" Received: by smtp.kernel.org (Postfix) with ESMTPSA id F0C411F000E9; Wed, 20 May 2026 18:40:42 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1779302443; bh=xvAtnBigW7+tyY7yjSfsnn/RaFqtaEeXF/msv2NaknA=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=d3UI0ZEW7khIFXcnTKSMJdy/ryyLLbGvju+nb7+blUoEhLtRT/aRM/dpwf+iKteaj x5AX6jgv90QipC8k79doSzl1DkF1bYbeG1rSjSDpSGl14kmYQaQFYKnPKysoWc6wvz HIRU/s4OIrzxJiIcdzz7fPx7T1gfdhN1fvFuoo9U= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Pengpeng Hou , =?UTF-8?q?Ilpo=20J=C3=A4rvinen?= , Sasha Levin Subject: [PATCH 6.6 270/508] platform/x86: dell-wmi-sysman: bound enumeration string aggregation Date: Wed, 20 May 2026 18:21:33 +0200 Message-ID: <20260520162104.495941797@linuxfoundation.org> X-Mailer: git-send-email 2.54.0 In-Reply-To: <20260520162058.573354582@linuxfoundation.org> References: <20260520162058.573354582@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit 6.6-stable review patch. If anyone has any objections, please let me know. ------------------ From: Pengpeng Hou [ Upstream commit 3c34471c26abc52a37f5ad90949e2e4b8027eb14 ] populate_enum_data() aggregates firmware-provided value-modifier and possible-value strings into fixed 512-byte struct members. The current code bounds each individual source string but then appends every string and separator with raw strcat() and no remaining-space check. Switch the aggregation loops to a bounded append helper and reject enumeration packages whose combined strings do not fit in the destination buffers. Fixes: e8a60aa7404b ("platform/x86: Introduce support for Systems Management Driver over WMI for Dell Systems") Signed-off-by: Pengpeng Hou Link: https://patch.msgid.link/20260408084501.1-dell-wmi-sysman-v2-pengpeng@iscas.ac.cn [ij: add include] Reviewed-by: Ilpo Järvinen Signed-off-by: Ilpo Järvinen Signed-off-by: Sasha Levin --- .../dell/dell-wmi-sysman/enum-attributes.c | 34 +++++++++++++++---- 1 file changed, 28 insertions(+), 6 deletions(-) diff --git a/drivers/platform/x86/dell/dell-wmi-sysman/enum-attributes.c b/drivers/platform/x86/dell/dell-wmi-sysman/enum-attributes.c index fc2f58b4cbc6e..7e44ba3015627 100644 --- a/drivers/platform/x86/dell/dell-wmi-sysman/enum-attributes.c +++ b/drivers/platform/x86/dell/dell-wmi-sysman/enum-attributes.c @@ -6,10 +6,32 @@ * Copyright (c) 2020 Dell Inc. */ +#include + #include "dell-wmi-sysman.h" get_instance_id(enumeration); +static int append_enum_string(char *dest, const char *src) +{ + size_t dest_len = strlen(dest); + ssize_t copied; + + if (WARN_ON_ONCE(dest_len >= MAX_BUFF)) + return -EINVAL; + + copied = strscpy(dest + dest_len, src, MAX_BUFF - dest_len); + if (copied < 0) + return -EINVAL; + + dest_len += copied; + copied = strscpy(dest + dest_len, ";", MAX_BUFF - dest_len); + if (copied < 0) + return -EINVAL; + + return 0; +} + static ssize_t current_value_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) { int instance_id = get_enumeration_instance_id(kobj); @@ -176,9 +198,9 @@ int populate_enum_data(union acpi_object *enumeration_obj, int instance_id, return -EINVAL; if (check_property_type(enumeration, next_obj, ACPI_TYPE_STRING)) return -EINVAL; - strcat(wmi_priv.enumeration_data[instance_id].dell_value_modifier, - enumeration_obj[next_obj++].string.pointer); - strcat(wmi_priv.enumeration_data[instance_id].dell_value_modifier, ";"); + if (append_enum_string(wmi_priv.enumeration_data[instance_id].dell_value_modifier, + enumeration_obj[next_obj++].string.pointer)) + return -EINVAL; } if (next_obj >= enum_property_count) @@ -193,9 +215,9 @@ int populate_enum_data(union acpi_object *enumeration_obj, int instance_id, return -EINVAL; if (check_property_type(enumeration, next_obj, ACPI_TYPE_STRING)) return -EINVAL; - strcat(wmi_priv.enumeration_data[instance_id].possible_values, - enumeration_obj[next_obj++].string.pointer); - strcat(wmi_priv.enumeration_data[instance_id].possible_values, ";"); + if (append_enum_string(wmi_priv.enumeration_data[instance_id].possible_values, + enumeration_obj[next_obj++].string.pointer)) + return -EINVAL; } return sysfs_create_group(attr_name_kobj, &enumeration_attr_group); -- 2.53.0