From patchwork Wed Mar 11 08:04:39 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Takashi Iwai X-Patchwork-Id: 11431023 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 3FFDF92A for ; Wed, 11 Mar 2020 08:04:42 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 288FC20873 for ; Wed, 11 Mar 2020 08:04:42 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726160AbgCKIEl (ORCPT ); Wed, 11 Mar 2020 04:04:41 -0400 Received: from mx2.suse.de ([195.135.220.15]:58518 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726198AbgCKIEl (ORCPT ); Wed, 11 Mar 2020 04:04:41 -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 30A03AC69; Wed, 11 Mar 2020 08:04:40 +0000 (UTC) From: Takashi Iwai To: Ulf Hansson Cc: linux-mmc@vger.kernel.org Subject: [PATCH] mmc: vub300: Use scnprintf() for avoiding potential buffer overflow Date: Wed, 11 Mar 2020 09:04:39 +0100 Message-Id: <20200311080439.13928-1-tiwai@suse.de> X-Mailer: git-send-email 2.16.4 Sender: linux-mmc-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-mmc@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/mmc/host/vub300.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/mmc/host/vub300.c b/drivers/mmc/host/vub300.c index 6ced1b7f642f..4008871bc2ec 100644 --- a/drivers/mmc/host/vub300.c +++ b/drivers/mmc/host/vub300.c @@ -1363,7 +1363,7 @@ static void download_offload_pseudocode(struct vub300_mmc_host *vub300) int retval; for (n = 0; n < sdio_funcs; n++) { struct sdio_func *sf = card->sdio_func[n]; - l += snprintf(vub300->vub_name + l, + l += scnprintf(vub300->vub_name + l, sizeof(vub300->vub_name) - l, "_%04X%04X", sf->vendor, sf->device); }