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 07FC4C19F2A for ; Thu, 11 Aug 2022 16:38:49 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S238986AbiHKQip (ORCPT ); Thu, 11 Aug 2022 12:38:45 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:59538 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S238916AbiHKQd5 (ORCPT ); Thu, 11 Aug 2022 12:33:57 -0400 Received: from sin.source.kernel.org (sin.source.kernel.org [IPv6:2604:1380:40e1:4800::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 1F899BC134; Thu, 11 Aug 2022 09:11:09 -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 sin.source.kernel.org (Postfix) with ESMTPS id 884F8CE22A8; Thu, 11 Aug 2022 16:11:07 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 2525EC433C1; Thu, 11 Aug 2022 16:11:05 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1660234266; bh=Xpr/rnGQQaHG9dOD8BYDruHGXokuH1u2GU461YavMCo=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=u1QxK7KXv4lQanwmw+cXa5pa1TJ3XWcsOl3JqWQjYxl2n7ZI+Dr1h/YTMi6m1cTzN eeGcsnpsNMCrGmtxHUbz5gKDnviI9jFFrK7HQS/QQUMnGqJiQF4zAQmqFCRebr53X2 TmuW0el1fOMYZtnT9kg33CtqbaUdcjDDUjiSS0HYftc6oem5vs+s+ibdn/8dwy70W0 zc9hutBq2VxJzB87ODom1Nx1rxIEeMLRoV/IKsVQQKYWjPJvgQEVso33l17V0NmD6w e4BWMQSnWKaIKyjDir2WjVlA31qG8S+zqCr+25Aji6GcwlkZRLxZF2WN2WrdbFirt8 Y7nPoY8IsjHKA== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Oliver Neukum , Hans Verkuil , Mauro Carvalho Chehab , Sasha Levin , crope@iki.fi, linux-media@vger.kernel.org Subject: [PATCH AUTOSEL 4.14 05/14] media: airspy: respect the DMA coherency rules Date: Thu, 11 Aug 2022 12:10:34 -0400 Message-Id: <20220811161050.1543183-5-sashal@kernel.org> X-Mailer: git-send-email 2.35.1 In-Reply-To: <20220811161050.1543183-1-sashal@kernel.org> References: <20220811161050.1543183-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Oliver Neukum [ Upstream commit ca9dc8d06ab64543a6a31adac5003349c5671218 ] If we want to avoid memory corruption on incoherent architectures, buffers for DMA must not reside - on the stack - embedded within other structures Allocate them separately. v2: fix uninitialized return value Signed-off-by: Oliver Neukum Signed-off-by: Hans Verkuil Signed-off-by: Mauro Carvalho Chehab Signed-off-by: Sasha Levin --- drivers/media/usb/airspy/airspy.c | 17 +++++++++++++++-- 1 file changed, 15 insertions(+), 2 deletions(-) diff --git a/drivers/media/usb/airspy/airspy.c b/drivers/media/usb/airspy/airspy.c index e70c9e2f3798..681753934948 100644 --- a/drivers/media/usb/airspy/airspy.c +++ b/drivers/media/usb/airspy/airspy.c @@ -134,7 +134,7 @@ struct airspy { /* USB control message buffer */ #define BUF_SIZE 128 - u8 buf[BUF_SIZE]; + u8 *buf; /* Current configuration */ unsigned int f_adc; @@ -872,6 +872,7 @@ static void airspy_video_release(struct v4l2_device *v) v4l2_ctrl_handler_free(&s->hdl); v4l2_device_unregister(&s->v4l2_dev); + kfree(s->buf); kfree(s); } @@ -979,7 +980,10 @@ static int airspy_probe(struct usb_interface *intf, { struct airspy *s; int ret; - u8 u8tmp, buf[BUF_SIZE]; + u8 u8tmp, *buf; + + buf = NULL; + ret = -ENOMEM; s = kzalloc(sizeof(struct airspy), GFP_KERNEL); if (s == NULL) { @@ -987,6 +991,13 @@ static int airspy_probe(struct usb_interface *intf, return -ENOMEM; } + s->buf = kzalloc(BUF_SIZE, GFP_KERNEL); + if (!s->buf) + goto err_free_mem; + buf = kzalloc(BUF_SIZE, GFP_KERNEL); + if (!buf) + goto err_free_mem; + mutex_init(&s->v4l2_lock); mutex_init(&s->vb_queue_lock); spin_lock_init(&s->queued_bufs_lock); @@ -1082,6 +1093,8 @@ static int airspy_probe(struct usb_interface *intf, v4l2_ctrl_handler_free(&s->hdl); v4l2_device_unregister(&s->v4l2_dev); err_free_mem: + kfree(buf); + kfree(s->buf); kfree(s); return ret; } -- 2.35.1