linux-kernel - [PATCH 5.10 213/221] r8169: fix DMA being used after buffer free if WoL is enabled

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20210329075636.239478548@linuxfoundation.org>
Date:   Mon, 29 Mar 2021 09:59:04 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Paul Blazejowski <paulb@...zebox.homeip.net>,
        Heiner Kallweit <hkallweit1@...il.com>,
        "David S. Miller" <davem@...emloft.net>
Subject: [PATCH 5.10 213/221] r8169: fix DMA being used after buffer free if WoL is enabled

From: Heiner Kallweit <hkallweit1@...il.com>

commit f658b90977d2e79822a558e48116e059a7e75dec upstream.

IOMMU errors have been reported if WoL is enabled and interface is
brought down. It turned out that the network chip triggers DMA
transfers after the DMA buffers have been freed. For WoL to work we
need to leave rx enabled, therefore simply stop the chip from being
a DMA busmaster.

Fixes: 567ca57faa62 ("r8169: add rtl8169_up")
Tested-by: Paul Blazejowski <paulb@...zebox.homeip.net>
Signed-off-by: Heiner Kallweit <hkallweit1@...il.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/net/ethernet/realtek/r8169_main.c |    6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

--- a/drivers/net/ethernet/realtek/r8169_main.c
+++ b/drivers/net/ethernet/realtek/r8169_main.c
@@ -4726,6 +4726,9 @@ static void rtl8169_down(struct rtl8169_
 
 	rtl8169_update_counters(tp);
 
+	pci_clear_master(tp->pci_dev);
+	rtl_pci_commit(tp);
+
 	rtl8169_cleanup(tp, true);
 
 	rtl_pll_power_down(tp);
@@ -4733,6 +4736,7 @@ static void rtl8169_down(struct rtl8169_
 
 static void rtl8169_up(struct rtl8169_private *tp)
 {
+	pci_set_master(tp->pci_dev);
 	rtl_pll_power_up(tp);
 	rtl8169_init_phy(tp);
 	napi_enable(&tp->napi);
@@ -5394,8 +5398,6 @@ static int rtl_init_one(struct pci_dev *
 
 	rtl_hw_reset(tp);
 
-	pci_set_master(pdev);
-
 	rc = rtl_alloc_irq(tp);
 	if (rc < 0) {
 		dev_err(&pdev->dev, "Can't allocate interrupt\n");