netdev - [PATCH] net: lio_core: fix two NULL pointer dereferences

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Message-Id: <20190311060142.15377-1-kjlu@umn.edu>
Date:   Mon, 11 Mar 2019 01:01:41 -0500
From:   Kangjie Lu <kjlu@....edu>
To:     kjlu@....edu
Cc:     pakki001@....edu, Derek Chickles <dchickles@...vell.com>,
        Satanand Burla <sburla@...vell.com>,
        Felix Manlunas <fmanlunas@...vell.com>,
        "David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] net: lio_core: fix two NULL pointer dereferences

In case octeon_alloc_soft_command fails, the fix reports the
error and returns to avoid NULL pointer dereferences.

Signed-off-by: Kangjie Lu <kjlu@....edu>
---
 drivers/net/ethernet/cavium/liquidio/lio_core.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/drivers/net/ethernet/cavium/liquidio/lio_core.c b/drivers/net/ethernet/cavium/liquidio/lio_core.c
index e21bf3724611..1c50c10b5a16 100644
--- a/drivers/net/ethernet/cavium/liquidio/lio_core.c
+++ b/drivers/net/ethernet/cavium/liquidio/lio_core.c
@@ -1211,6 +1211,11 @@ int liquidio_change_mtu(struct net_device *netdev, int new_mtu)
 
 	sc = (struct octeon_soft_command *)
 		octeon_alloc_soft_command(oct, OCTNET_CMD_SIZE, 16, 0);
+	if (!sc) {
+		netif_info(lio, rx_err, lio->netdev,
+			   "Failed to allocate soft command\n");
+		return -ENOMEM;
+	}
 
 	ncmd = (union octnet_cmd *)sc->virtdptr;
 
@@ -1684,6 +1689,11 @@ int liquidio_set_fec(struct lio *lio, int on_off)
 
 	sc = octeon_alloc_soft_command(oct, OCTNET_CMD_SIZE,
 				       sizeof(struct oct_nic_seapi_resp), 0);
+	if (!sc) {
+		dev_err(&oct->pci_dev->dev,
+			"Failed to allocate soft command\n");
+		return -ENOMEM;
+	}
 
 	ncmd = sc->virtdptr;
 	resp = sc->virtrptr;
-- 
2.17.1