netdev - [PATCH net-next] ionic: return -EFAULT if copy_to

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Message-ID: <YHV230jUzxBJxlPS@mwanda>
Date:   Tue, 13 Apr 2021 13:47:59 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     Shannon Nelson <snelson@...sando.io>
Cc:     drivers@...sando.io, "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Allen Hubbe <allenbh@...sando.io>, netdev@...r.kernel.org,
        kernel-janitors@...r.kernel.org
Subject: [PATCH net-next] ionic: return -EFAULT if copy_to_user() fails

The copy_to_user() function returns the number of bytes that it wasn't
able to copy.  We want to return -EFAULT to the user.

Fixes: fee6efce565d ("ionic: add hw timestamp support files")
Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
---
 drivers/net/ethernet/pensando/ionic/ionic_phc.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/pensando/ionic/ionic_phc.c b/drivers/net/ethernet/pensando/ionic/ionic_phc.c
index 86ae5011ac9b..d7d8d5e81ea0 100644
--- a/drivers/net/ethernet/pensando/ionic/ionic_phc.c
+++ b/drivers/net/ethernet/pensando/ionic/ionic_phc.c
@@ -225,7 +225,9 @@ int ionic_lif_hwstamp_get(struct ionic_lif *lif, struct ifreq *ifr)
 	memcpy(&config, &lif->phc->ts_config, sizeof(config));
 	mutex_unlock(&lif->phc->config_lock);
 
-	return copy_to_user(ifr->ifr_data, &config, sizeof(config));
+	if (copy_to_user(ifr->ifr_data, &config, sizeof(config)))
+		return -EFAULT;
+	return 0;
 }
 
 static u64 ionic_hwstamp_read(struct ionic *ionic,
-- 
2.30.2