net: liquidio: Add missing null pointer checks

The functions send_rx_ctrl_cmd() in both liquidio/lio_main.c and
liquidio/lio_vf_main.c do not check if the call to
octeon_alloc_soft_command() fails and returns a null pointer. Both
functions also return void so errors are not propagated back to the
caller.

Fix these issues by updating both instances of send_rx_ctrl_cmd() to
return an integer rather than void, and have them return -ENOMEM if an
allocation failure occurs. Also update all callers of send_rx_ctrl_cmd()
so that they now check the return value.

Cc: David S. Miller <davem@davemloft.net>
Signed-off-by: Tom Seewald <tseewald@gmail.com>
Link: https://lore.kernel.org/r/20210503115736.2104747-66-gregkh@linuxfoundation.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/net/ethernet/cavium/liquidio/lio_main.c b/drivers/net/ethernet/cavium/liquidio/lio_main.c
index 6fa5700..591229b 100644 (file)
--- a/drivers/net/ethernet/cavium/liquidio/lio_main.c
+++ b/drivers/net/ethernet/cavium/liquidio/lio_main.c
@@ -1153,7 +1153,7 @@ static void octeon_destroy_resources(struct octeon_device *oct)
  * @lio: per-network private data
  * @start_stop: whether to start or stop
  */
-static void send_rx_ctrl_cmd(struct lio *lio, int start_stop)
+static int send_rx_ctrl_cmd(struct lio *lio, int start_stop)
 {
        struct octeon_soft_command *sc;
        union octnet_cmd *ncmd;
@@ -1161,11 +1161,16 @@ static void send_rx_ctrl_cmd(struct lio *lio, int start_stop)
        int retval;
 
        if (oct->props[lio->ifidx].rx_on == start_stop)
-               return;
+               return 0;
 
        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 octeon_soft_command struct\n");
+               return -ENOMEM;
+       }
 
        ncmd = (union octnet_cmd *)sc->virtdptr;
 
@@ -1187,18 +1192,19 @@ static void send_rx_ctrl_cmd(struct lio *lio, int start_stop)
        if (retval == IQ_SEND_FAILED) {
                netif_info(lio, rx_err, lio->netdev, "Failed to send RX Control message\n");
                octeon_free_soft_command(oct, sc);
-               return;
        } else {
                /* Sleep on a wait queue till the cond flag indicates that the
                 * response arrived or timed-out.
                 */
                retval = wait_for_sc_completion_timeout(oct, sc, 0);
                if (retval)
-                       return;
+                       return retval;
 
                oct->props[lio->ifidx].rx_on = start_stop;
                WRITE_ONCE(sc->caller_is_done, true);
        }
+
+       return retval;
 }
 
 /**
@@ -1773,6 +1779,7 @@ static int liquidio_open(struct net_device *netdev)
        struct octeon_device_priv *oct_priv =
                (struct octeon_device_priv *)oct->priv;
        struct napi_struct *napi, *n;
+       int ret = 0;
 
        if (oct->props[lio->ifidx].napi_enabled == 0) {
                tasklet_disable(&oct_priv->droq_tasklet);
@@ -1808,7 +1815,9 @@ static int liquidio_open(struct net_device *netdev)
        netif_info(lio, ifup, lio->netdev, "Interface Open, ready for traffic\n");
 
        /* tell Octeon to start forwarding packets to host */
-       send_rx_ctrl_cmd(lio, 1);
+       ret = send_rx_ctrl_cmd(lio, 1);
+       if (ret)
+               return ret;
 
        /* start periodical statistics fetch */
        INIT_DELAYED_WORK(&lio->stats_wk.work, lio_fetch_stats);
@@ -1819,7 +1828,7 @@ static int liquidio_open(struct net_device *netdev)
        dev_info(&oct->pci_dev->dev, "%s interface is opened\n",
                 netdev->name);
 
-       return 0;
+       return ret;
 }
 
 /**
@@ -1833,6 +1842,7 @@ static int liquidio_stop(struct net_device *netdev)
        struct octeon_device_priv *oct_priv =
                (struct octeon_device_priv *)oct->priv;
        struct napi_struct *napi, *n;
+       int ret = 0;
 
        ifstate_reset(lio, LIO_IFSTATE_RUNNING);
 
@@ -1849,7 +1859,9 @@ static int liquidio_stop(struct net_device *netdev)
        lio->link_changes++;
 
        /* Tell Octeon that nic interface is down. */
-       send_rx_ctrl_cmd(lio, 0);
+       ret = send_rx_ctrl_cmd(lio, 0);
+       if (ret)
+               return ret;
 
        if (OCTEON_CN23XX_PF(oct)) {
                if (!oct->msix_on)
@@ -1884,7 +1896,7 @@ static int liquidio_stop(struct net_device *netdev)
 
        dev_info(&oct->pci_dev->dev, "%s interface is stopped\n", netdev->name);
 
-       return 0;
+       return ret;
 }
 
 /**

diff --git a/drivers/net/ethernet/cavium/liquidio/lio_vf_main.c b/drivers/net/ethernet/cavium/liquidio/lio_vf_main.c
index 516f166..ffddb31 100644 (file)
--- a/drivers/net/ethernet/cavium/liquidio/lio_vf_main.c
+++ b/drivers/net/ethernet/cavium/liquidio/lio_vf_main.c
@@ -595,7 +595,7 @@ static void octeon_destroy_resources(struct octeon_device *oct)
  * @lio: per-network private data
  * @start_stop: whether to start or stop
  */
-static void send_rx_ctrl_cmd(struct lio *lio, int start_stop)
+static int send_rx_ctrl_cmd(struct lio *lio, int start_stop)
 {
        struct octeon_device *oct = (struct octeon_device *)lio->oct_dev;
        struct octeon_soft_command *sc;
@@ -603,11 +603,16 @@ static void send_rx_ctrl_cmd(struct lio *lio, int start_stop)
        int retval;
 
        if (oct->props[lio->ifidx].rx_on == start_stop)
-               return;
+               return 0;
 
        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 octeon_soft_command struct\n");
+               return -ENOMEM;
+       }
 
        ncmd = (union octnet_cmd *)sc->virtdptr;
 
@@ -635,11 +640,13 @@ static void send_rx_ctrl_cmd(struct lio *lio, int start_stop)
                 */
                retval = wait_for_sc_completion_timeout(oct, sc, 0);
                if (retval)
-                       return;
+                       return retval;
 
                oct->props[lio->ifidx].rx_on = start_stop;
                WRITE_ONCE(sc->caller_is_done, true);
        }
+
+       return retval;
 }
 
 /**
@@ -906,6 +913,7 @@ static int liquidio_open(struct net_device *netdev)
        struct octeon_device_priv *oct_priv =
                (struct octeon_device_priv *)oct->priv;
        struct napi_struct *napi, *n;
+       int ret = 0;
 
        if (!oct->props[lio->ifidx].napi_enabled) {
                tasklet_disable(&oct_priv->droq_tasklet);
@@ -932,11 +940,13 @@ static int liquidio_open(struct net_device *netdev)
                                        (LIQUIDIO_NDEV_STATS_POLL_TIME_MS));
 
        /* tell Octeon to start forwarding packets to host */
-       send_rx_ctrl_cmd(lio, 1);
+       ret = send_rx_ctrl_cmd(lio, 1);
+       if (ret)
+               return ret;
 
        dev_info(&oct->pci_dev->dev, "%s interface is opened\n", netdev->name);
 
-       return 0;
+       return ret;
 }
 
 /**
@@ -950,9 +960,12 @@ static int liquidio_stop(struct net_device *netdev)
        struct octeon_device_priv *oct_priv =
                (struct octeon_device_priv *)oct->priv;
        struct napi_struct *napi, *n;
+       int ret = 0;
 
        /* tell Octeon to stop forwarding packets to host */
-       send_rx_ctrl_cmd(lio, 0);
+       ret = send_rx_ctrl_cmd(lio, 0);
+       if (ret)
+               return ret;
 
        netif_info(lio, ifdown, lio->netdev, "Stopping interface!\n");
        /* Inform that netif carrier is down */
@@ -986,7 +999,7 @@ static int liquidio_stop(struct net_device *netdev)
 
        dev_info(&oct->pci_dev->dev, "%s interface is stopped\n", netdev->name);
 
-       return 0;
+       return ret;
 }
 
 /**