From patchwork Wed Mar 11 07:38:24 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Takashi Iwai X-Patchwork-Id: 11430965 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id EDC2814B7 for ; Wed, 11 Mar 2020 07:38:27 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id D6B6521D7E for ; Wed, 11 Mar 2020 07:38:27 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728146AbgCKHi1 (ORCPT ); Wed, 11 Mar 2020 03:38:27 -0400 Received: from mx2.suse.de ([195.135.220.15]:45990 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726160AbgCKHi1 (ORCPT ); Wed, 11 Mar 2020 03:38:27 -0400 X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.220.254]) by mx2.suse.de (Postfix) with ESMTP id 8F247AD72; Wed, 11 Mar 2020 07:38:25 +0000 (UTC) From: Takashi Iwai To: Jiri Kosina , Jonathan Cameron , Srinivas Pandruvada Cc: linux-input@vger.kernel.org, linux-iio@vger.kernel.org Subject: [PATCH] HID: hid-sensor-custom: Use scnprintf() for avoiding potential buffer overflow Date: Wed, 11 Mar 2020 08:38:24 +0100 Message-Id: <20200311073824.7431-1-tiwai@suse.de> X-Mailer: git-send-email 2.16.4 Sender: linux-iio-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-iio@vger.kernel.org Since snprintf() returns the would-be-output size instead of the actual output size, the succeeding calls may go beyond the given buffer limit. Fix it by replacing with scnprintf(). Signed-off-by: Takashi Iwai --- drivers/hid/hid-sensor-custom.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/drivers/hid/hid-sensor-custom.c b/drivers/hid/hid-sensor-custom.c index fb827c295842..4d25577a8573 100644 --- a/drivers/hid/hid-sensor-custom.c +++ b/drivers/hid/hid-sensor-custom.c @@ -313,7 +313,7 @@ static ssize_t show_value(struct device *dev, struct device_attribute *attr, while (i < ret) { if (i + attribute->size > ret) { - len += snprintf(&buf[len], + len += scnprintf(&buf[len], PAGE_SIZE - len, "%d ", values[i]); break; @@ -336,10 +336,10 @@ static ssize_t show_value(struct device *dev, struct device_attribute *attr, ++i; break; } - len += snprintf(&buf[len], PAGE_SIZE - len, + len += scnprintf(&buf[len], PAGE_SIZE - len, "%lld ", value); } - len += snprintf(&buf[len], PAGE_SIZE - len, "\n"); + len += scnprintf(&buf[len], PAGE_SIZE - len, "\n"); return len; } else if (input)