linux-kernel - [PATCH 5.5 131/176] net: atlantic: possible fault in transition to hibernation

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Date:   Tue,  3 Mar 2020 18:43:15 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Pavel Belous <pbelous@...vell.com>,
        Nikita Danilov <ndanilov@...vell.com>,
        Igor Russkikh <irusskikh@...vell.com>,
        Dmitry Bogdanov <dbogdanov@...vell.com>,
        "David S. Miller" <davem@...emloft.net>
Subject: [PATCH 5.5 131/176] net: atlantic: possible fault in transition to hibernation

From: Pavel Belous <pbelous@...vell.com>

commit 52a22f4d6ff95e8bdca557765c04893eb5dd83fd upstream.

during hibernation freeze, aq_nic_stop could be invoked
on a stopped device. That may cause panic on access to
not yet allocated vector/ring structures.

Add a check to stop device if it is not yet stopped.

Similiarly after freeze in hibernation thaw, aq_nic_start
could be invoked on a not initialized net device.
Result will be the same.

Add a check to start device if it is initialized.
In our case, this is the same as started.

Fixes: 8aaa112a57c1 ("net: atlantic: refactoring pm logic")
Signed-off-by: Pavel Belous <pbelous@...vell.com>
Signed-off-by: Nikita Danilov <ndanilov@...vell.com>
Signed-off-by: Igor Russkikh <irusskikh@...vell.com>
Signed-off-by: Dmitry Bogdanov <dbogdanov@...vell.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/net/ethernet/aquantia/atlantic/aq_pci_func.c |   13 ++++++++-----
 1 file changed, 8 insertions(+), 5 deletions(-)

--- a/drivers/net/ethernet/aquantia/atlantic/aq_pci_func.c
+++ b/drivers/net/ethernet/aquantia/atlantic/aq_pci_func.c
@@ -359,7 +359,8 @@ static int aq_suspend_common(struct devi
 	netif_device_detach(nic->ndev);
 	netif_tx_stop_all_queues(nic->ndev);

-	aq_nic_stop(nic);
+	if (netif_running(nic->ndev))
+		aq_nic_stop(nic);

 	if (deep) {
 		aq_nic_deinit(nic, !nic->aq_hw->aq_nic_cfg->wol);
@@ -375,7 +376,7 @@ static int atl_resume_common(struct devi
 {
 	struct pci_dev *pdev = to_pci_dev(dev);
 	struct aq_nic_s *nic;
-	int ret;
+	int ret = 0;

 	nic = pci_get_drvdata(pdev);

@@ -390,9 +391,11 @@ static int atl_resume_common(struct devi
 			goto err_exit;
 	}

-	ret = aq_nic_start(nic);
-	if (ret)
-		goto err_exit;
+	if (netif_running(nic->ndev)) {
+		ret = aq_nic_start(nic);
+		if (ret)
+			goto err_exit;
+	}

 	netif_device_attach(nic->ndev);
 	netif_tx_start_all_queues(nic->ndev);