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netvsc: fix dereference before null check errors

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ndev is being checked to see if it is a null pointer however before
the null check ndev is being dereferenced; hence there is a potential
null pointer dereference bug that needs fixing. Fix this by only
dereferencing ndev after the null check.

Detected by CoverityScan, CID#1420760, CID#140761 ("Dereference
before null check")

Signed-off-by: Colin Ian King <colin.king@canonical.com>
Reviewed-by: Haiyang Zhang <haiyangz@microsoft.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Colin Ian King 2017-03-25 14:26:39 +00:00 committed by David S. Miller
parent 86573f6152
commit eb996edb03
1 changed files with 4 additions and 2 deletions
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6
drivers/net/hyperv/netvsc_drv.c
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@ -1135,7 +1135,7 @@ static int netvsc_get_rxfh(struct net_device *dev, u32 *indir, u8 *key,
{
struct net_device_context *ndc = netdev_priv(dev);
struct netvsc_device *ndev = rcu_dereference(ndc->nvdev);
struct rndis_device *rndis_dev = ndev->extension;
struct rndis_device *rndis_dev;
int i;
if (!ndev)
@ -1144,6 +1144,7 @@ static int netvsc_get_rxfh(struct net_device *dev, u32 *indir, u8 *key,
if (hfunc)
*hfunc = ETH_RSS_HASH_TOP; /* Toeplitz */
rndis_dev = ndev->extension;
if (indir) {
for (i = 0; i < ITAB_NUM; i++)
indir[i] = rndis_dev->ind_table[i];
@ -1160,7 +1161,7 @@ static int netvsc_set_rxfh(struct net_device *dev, const u32 *indir,
{
struct net_device_context *ndc = netdev_priv(dev);
struct netvsc_device *ndev = rtnl_dereference(ndc->nvdev);
struct rndis_device *rndis_dev = ndev->extension;
struct rndis_device *rndis_dev;
int i;
if (!ndev)
@ -1169,6 +1170,7 @@ static int netvsc_set_rxfh(struct net_device *dev, const u32 *indir,
if (hfunc != ETH_RSS_HASH_NO_CHANGE && hfunc != ETH_RSS_HASH_TOP)
return -EOPNOTSUPP;
rndis_dev = ndev->extension;
if (indir) {
for (i = 0; i < ITAB_NUM; i++)
if (indir[i] >= dev->num_rx_queues)