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| author | Colin Ian King <colin.king@canonical.com> | 2018-11-24 15:03:02 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2018-11-24 17:40:35 -0800 |
| commit | 3c18aa1464f9232d6abac8d7b4540f61b0658d62 (patch) | |
| tree | f0a0602eebf761b741426a62a03450ca6d95a6eb /drivers | |
| parent | 21ab664aece634ade40ad9d1cca589895e9f9174 (diff) | |
| download | linux-3c18aa1464f9232d6abac8d7b4540f61b0658d62.tar.gz linux-3c18aa1464f9232d6abac8d7b4540f61b0658d62.tar.bz2 linux-3c18aa1464f9232d6abac8d7b4540f61b0658d62.zip | |
net: qualcomm: rmnet: move null check on dev before dereferecing it
Currently dev is dereferenced by the call dev_net(dev) before dev is null
checked. Fix this by null checking dev before the potential null
pointer dereference.
Detected by CoverityScan, CID#1462955 ("Dereference before null check")
Fixes: 23790ef12082 ("net: qualcomm: rmnet: Allow to configure flags for existing devices")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/net/ethernet/qualcomm/rmnet/rmnet_config.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/drivers/net/ethernet/qualcomm/rmnet/rmnet_config.c b/drivers/net/ethernet/qualcomm/rmnet/rmnet_config.c index 5f4e447c5dce..b8bbee645f51 100644 --- a/drivers/net/ethernet/qualcomm/rmnet/rmnet_config.c +++ b/drivers/net/ethernet/qualcomm/rmnet/rmnet_config.c @@ -301,10 +301,13 @@ static int rmnet_changelink(struct net_device *dev, struct nlattr *tb[], struct rmnet_port *port; u16 mux_id; + if (!dev) + return -ENODEV; + real_dev = __dev_get_by_index(dev_net(dev), nla_get_u32(tb[IFLA_LINK])); - if (!real_dev || !dev || !rmnet_is_real_dev_registered(real_dev)) + if (!real_dev || !rmnet_is_real_dev_registered(real_dev)) return -ENODEV; port = rmnet_get_port_rtnl(real_dev); |