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| author | Nikolay Aleksandrov <nikolay@cumulusnetworks.com> | 2015-11-21 17:57:24 +0300 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2015-11-23 23:06:37 +0300 |
| commit | 1113ebbcf9e43c80fe5ef05c48b4cd1c25b306b2 (patch) | |
| tree | 1480a9304cdc5fd6825cce5dd2a9275e74520ee7 /net/ipv4/ipmr.c | |
| parent | 930d3142b87a5c08b4dd00a97d503b6d412a9fda (diff) | |
| download | linux-1113ebbcf9e43c80fe5ef05c48b4cd1c25b306b2.tar.xz | |
net: ipmr: move the tbl id check in ipmr_new_table
Move the table id check in ipmr_new_table and make it return error
pointer. We need this change for the upcoming netlink table manipulation
support in order to avoid code duplication and a race condition.
Signed-off-by: Nikolay Aleksandrov <nikolay@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/ipmr.c')
| -rw-r--r-- | net/ipv4/ipmr.c | 28 |
1 files changed, 17 insertions, 11 deletions
diff --git a/net/ipv4/ipmr.c b/net/ipv4/ipmr.c index 92dd4b74d513..5271e2eee110 100644 --- a/net/ipv4/ipmr.c +++ b/net/ipv4/ipmr.c @@ -252,8 +252,8 @@ static int __net_init ipmr_rules_init(struct net *net) INIT_LIST_HEAD(&net->ipv4.mr_tables); mrt = ipmr_new_table(net, RT_TABLE_DEFAULT); - if (!mrt) { - err = -ENOMEM; + if (IS_ERR(mrt)) { + err = PTR_ERR(mrt); goto err1; } @@ -301,8 +301,13 @@ static int ipmr_fib_lookup(struct net *net, struct flowi4 *flp4, static int __net_init ipmr_rules_init(struct net *net) { - net->ipv4.mrt = ipmr_new_table(net, RT_TABLE_DEFAULT); - return net->ipv4.mrt ? 0 : -ENOMEM; + struct mr_table *mrt; + + mrt = ipmr_new_table(net, RT_TABLE_DEFAULT); + if (IS_ERR(mrt)) + return PTR_ERR(mrt); + net->ipv4.mrt = mrt; + return 0; } static void __net_exit ipmr_rules_exit(struct net *net) @@ -319,13 +324,17 @@ static struct mr_table *ipmr_new_table(struct net *net, u32 id) struct mr_table *mrt; unsigned int i; + /* "pimreg%u" should not exceed 16 bytes (IFNAMSIZ) */ + if (id != RT_TABLE_DEFAULT && id >= 1000000000) + return ERR_PTR(-EINVAL); + mrt = ipmr_get_table(net, id); if (mrt) return mrt; mrt = kzalloc(sizeof(*mrt), GFP_KERNEL); if (!mrt) - return NULL; + return ERR_PTR(-ENOMEM); write_pnet(&mrt->net, net); mrt->id = id; @@ -1407,17 +1416,14 @@ int ip_mroute_setsockopt(struct sock *sk, int optname, char __user *optval, unsi if (get_user(v, (u32 __user *)optval)) return -EFAULT; - /* "pimreg%u" should not exceed 16 bytes (IFNAMSIZ) */ - if (v != RT_TABLE_DEFAULT && v >= 1000000000) - return -EINVAL; - rtnl_lock(); ret = 0; if (sk == rtnl_dereference(mrt->mroute_sk)) { ret = -EBUSY; } else { - if (!ipmr_new_table(net, v)) - ret = -ENOMEM; + mrt = ipmr_new_table(net, v); + if (IS_ERR(mrt)) + ret = PTR_ERR(mrt); else raw_sk(sk)->ipmr_table = v; } |