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 7ED6F47DD59; Sat, 12 Sep 2026 13:29:15 +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=1789219756; cv=none; b=EhP5hd+gzRPxz7FiJYAMDLsEy8Wnijr1gCEi2npfPEQiJ0yycSB86Lq9ts5oAimyUMYka+G0voYu0J22zW/MLRMzhHbdTm/mMo7pPT39uWvXQ14AYm1Y5GWqNte/yfMSUSqEwFPJmJ7wFJTJ6yhrklO+YyG5rXSq4aCwJ3mFFwk= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789219756; c=relaxed/simple; bh=s7BRVsxlRe6UAbR8U7i961IgGKo13IUq1kii5GJ0NAo=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=LIz6/TneeguL6agS2IQ8GnzXt7RmSeMofc4/LwNm3SCSCYvhPN1rDO6tz/39yN5I8VSapcBgRqm+jCFzRra3u6fU88/nJltgR/um3beFf7LELfnG8agf7/3TgGfTFC0CtNo86cMYXKlinPyckO1UuostEERCCQgashwQDL+Cd9A= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=zge5L4yk; 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="zge5L4yk" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 1365B1F000FF; Sat, 12 Sep 2026 13:29:13 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1789219755; bh=gCl3fDKwnv3K1PmF26ubNe2QWmv/vtBg3k9FSiPQ3/o=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=zge5L4yk54TFssJ4M0TwNwr+ogYQCkFzqYa3684Z8R6yZIgo8HqnKP4Cn44+61ir6 qlE8DmTZdtZnZboTBwXRPwcNqPsziemmZ8b0+Y0hZsKNXMMuXlVEK/HPA/d/8TvLj2 mcgW5qwmn/KdMbVK5gziO5E5dsIqyuWGySkdKzmg= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, stable@kernel.org, Xingrui Li , Srinivas Pandruvada , Jiri Kosina Subject: [PATCH 6.6 0039/1424] HID: sensor-hub: Fix out-of-bounds write in sensor_hub_get_feature Date: Sat, 12 Sep 2026 08:41:11 +0200 Message-ID: <20260912065608.179198643@linuxfoundation.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260912065607.279695368@linuxfoundation.org> References: <20260912065607.279695368@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 6.6-stable review patch. If anyone has any objections, please let me know. ------------------ From: Xingrui Li commit c92693f3ed099401d0383ef35ca1fe1e6ba033de upstream. sensor_hub_get_feature() clamps its return value to the caller's buffer size, but the copy loop still copies field->report_size / 8 bytes for each report value. A malicious HID descriptor can advertise a large feature field size while an IIO caller supplies a small stack buffer, such as a single s32, causing an out-of-bounds write. HID core stores parsed report values in __s32 slots and clamps extracted values to 32 bits. Reject feature fields that require more than one slot per value, guard the total byte count calculation, and clamp each per-value copy to the remaining caller buffer. Fixes: 5459ada2b3cd69 ("HID: sensor-hub: Fix packing of result buffer for feature report") Cc: stable@kernel.org Assisted-by: OpenAI:GPT-5.5-Cyber Signed-off-by: Xingrui Li Acked-by: Srinivas Pandruvada Signed-off-by: Jiri Kosina Signed-off-by: Greg Kroah-Hartman --- drivers/hid/hid-sensor-hub.c | 44 +++++++++++++++++++++++++------------------ 1 file changed, 26 insertions(+), 18 deletions(-) --- a/drivers/hid/hid-sensor-hub.c +++ b/drivers/hid/hid-sensor-hub.c @@ -239,12 +239,17 @@ int sensor_hub_get_feature(struct hid_se u32 field_index, int buffer_size, void *buffer) { struct hid_report *report; + struct hid_field *field; struct sensor_hub_data *data = hid_get_drvdata(hsdev->hdev); - int report_size; + size_t field_size; + size_t report_size; + size_t copied = 0; + size_t to_copy; int ret = 0; - u8 *val_ptr; - int buffer_index = 0; - int i; + unsigned int i; + + if (!buffer || buffer_size <= 0) + return -EINVAL; memset(buffer, 0, buffer_size); @@ -258,26 +263,29 @@ int sensor_hub_get_feature(struct hid_se hid_hw_request(hsdev->hdev, report, HID_REQ_GET_REPORT); hid_hw_wait(hsdev->hdev); + field = report->field[field_index]; + /* calculate number of bytes required to read this field */ - report_size = DIV_ROUND_UP(report->field[field_index]->report_size, - 8) * - report->field[field_index]->report_count; - if (!report_size) { + field_size = DIV_ROUND_UP(field->report_size, 8); + /* HID core stores each parsed report value in a __s32 slot. */ + if (!field_size || field_size > sizeof(field->value[0])) { + ret = -EINVAL; + goto done_proc; + } + if (field->report_count > SIZE_MAX / field_size) { ret = -EINVAL; goto done_proc; } - ret = min(report_size, buffer_size); - val_ptr = (u8 *)report->field[field_index]->value; - for (i = 0; i < report->field[field_index]->report_count; ++i) { - if (buffer_index >= ret) - break; - - memcpy(&((u8 *)buffer)[buffer_index], val_ptr, - report->field[field_index]->report_size / 8); - val_ptr += sizeof(__s32); - buffer_index += (report->field[field_index]->report_size / 8); + report_size = field_size * field->report_count; + report_size = min_t(size_t, report_size, buffer_size); + + for (i = 0; i < field->report_count && copied < report_size; ++i) { + to_copy = min(field_size, report_size - copied); + memcpy(&((u8 *)buffer)[copied], &field->value[i], to_copy); + copied += to_copy; } + ret = copied; done_proc: mutex_unlock(&data->mutex);