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 9CBBD4137B2; Fri, 4 Sep 2026 05:41:58 +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=1788500519; cv=none; b=MD/XEpJ91UhR0X7CoZhhsjUnEKt8MGSEMx1KGwue+6qIku2B9rGfpz5m/tNRlUp/SS90Qf9bEUOFaObbbshEXUYRLIyeypZfJKAD/7vAgW2Vb8g8ATEKv7mXZ7s/qHasbO5DeREhjLzWaq5CRonO1XMxSqJC9HN3z566qjqihks= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788500519; c=relaxed/simple; bh=07PyxokZxQl7gT35t3HWL7EJ5GXufmNGhXdW+2S28OY=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=tBAmVwquwWW/EMytdm7oHET3kxH3ZzUWvCoiCAwDIF5/ALpiNEStW9GRsLITTV4VFw2hlELmt56sDuRmKWITDdegV1Omu8CK7fVR2xauZj5cXQx2FoEsMETU9lgXy9yFdmbNU/L+tAs5MDDAQioZmFWdxurYkxmFxDPX/tWUy2o= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=ITzBeDCy; 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="ITzBeDCy" Received: by smtp.kernel.org (Postfix) with ESMTPSA id EF49F1F00A3D; Fri, 4 Sep 2026 05:41:57 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1788500518; bh=ADeU2xq4pnfq9UejSFHkTJaaOOmCvWAEAu3wplpbJj8=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=ITzBeDCy71pwuli6KHOQU1cSbVRu7S8arMFP2hkXPCzwNOuixbHtPJlxL3DmEsIt5 QRfYCibAkM4w7KwFJ4LxBtnvflEgjpGz7ACAnZGQHuYbQ1GXlRptUQBaUmOeN+adwz XaNaHtGAKsj3sLC6BvrSXF1pPGBf8flvJH3BQFlw= 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 6.18 086/552] HID: sensor-hub: Fix out-of-bounds write in sensor_hub_get_feature Date: Fri, 4 Sep 2026 06:54:03 +0200 Message-ID: <20260904045749.824882130@linuxfoundation.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260904045747.813364717@linuxfoundation.org> References: <20260904045747.813364717@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 6.18-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);