From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 01B64C4332F for ; Mon, 23 May 2022 17:04:59 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S239186AbiEWRE6 (ORCPT ); Mon, 23 May 2022 13:04:58 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:47914 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S239311AbiEWRE5 (ORCPT ); Mon, 23 May 2022 13:04:57 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [IPv6:2604:1380:4641:c500::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id CFD6168313; Mon, 23 May 2022 10:04:54 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 31036614BB; Mon, 23 May 2022 17:04:54 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 2F393C385A9; Mon, 23 May 2022 17:04:53 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1653325493; bh=iBB4Xyk+CODao7GNk41ZGPTs4iuw6wqrIAr2W8C2D1Q=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=QSTaQmZQAP21CqJCyXKWD1E4hxerRnMnldpme7/1oGbsSf6Q3XopFrFBRDqS3gMnT uMppKoFLbk9QanvOIjN5QVW1uiqPKR399myHML+kCpvEMuGle9X4x1rHm11WaqOBFf J0IH0FFBmZFN7EFcGN1XKqSZGr+unjzwJpFfVyoU= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Linus Torvalds , Takashi Iwai Subject: [PATCH 4.9 10/25] ALSA: wavefront: Proper check of get_user() error Date: Mon, 23 May 2022 19:03:28 +0200 Message-Id: <20220523165746.470112101@linuxfoundation.org> X-Mailer: git-send-email 2.36.1 In-Reply-To: <20220523165743.398280407@linuxfoundation.org> References: <20220523165743.398280407@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Takashi Iwai commit a34ae6c0660d3b96b0055f68ef74dc9478852245 upstream. The antient ISA wavefront driver reads its sample patch data (uploaded over an ioctl) via __get_user() with no good reason; likely just for some performance optimizations in the past. Let's change this to the standard get_user() and the error check for handling the fault case properly. Reported-by: Linus Torvalds Cc: Link: https://lore.kernel.org/r/20220510103626.16635-1-tiwai@suse.de Signed-off-by: Takashi Iwai Signed-off-by: Greg Kroah-Hartman --- sound/isa/wavefront/wavefront_synth.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) --- a/sound/isa/wavefront/wavefront_synth.c +++ b/sound/isa/wavefront/wavefront_synth.c @@ -1091,7 +1091,8 @@ wavefront_send_sample (snd_wavefront_t * if (dataptr < data_end) { - __get_user (sample_short, dataptr); + if (get_user(sample_short, dataptr)) + return -EFAULT; dataptr += skip; if (data_is_unsigned) { /* GUS ? */