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| author | Davide Caratti <dcaratti@redhat.com> | 2018-03-19 15:31:27 +0100 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2018-03-21 18:12:27 -0400 |
| commit | d7f20015736048f494988093b59fe513dc232ce9 (patch) | |
| tree | 0d896a8d0fef849b6e1ce071ad81a99bb24cc8e0 /net/sched/act_vlan.c | |
| parent | 1e46ef1762bb2e52f0f996131a4d16ed4e9fd065 (diff) | |
| download | linux-d7f20015736048f494988093b59fe513dc232ce9.tar.bz2 | |
net/sched: fix idr leak in the error path of tcf_vlan_init()
tcf_vlan_init() can fail after the idr has been successfully reserved.
When this happens, every subsequent attempt to configure vlan rules using
the same idr value will systematically fail with -ENOSPC, unless the first
attempt was done using the 'replace' keyword.
# tc action add action vlan pop index 100
RTNETLINK answers: Cannot allocate memory
We have an error talking to the kernel
# tc action add action vlan pop index 100
RTNETLINK answers: No space left on device
We have an error talking to the kernel
# tc action add action vlan pop index 100
RTNETLINK answers: No space left on device
We have an error talking to the kernel
...
Fix this in tcf_vlan_init(), ensuring that tcf_idr_release() is called on
the error path when the idr has been reserved, but not yet inserted. Also,
don't test 'ovr' in the error path, to avoid a 'replace' failure implicitly
become a 'delete' that leaks refcount in act_vlan module:
# rmmod act_vlan; modprobe act_vlan
# tc action add action vlan push id 5 index 100
# tc action replace action vlan push id 7 index 100
RTNETLINK answers: Cannot allocate memory
We have an error talking to the kernel
# tc action list action vlan
#
# rmmod act_vlan
rmmod: ERROR: Module act_vlan is in use
Fixes: 4c5b9d9642c8 ("act_vlan: VLAN action rewrite to use RCU lock/unlock and update")
Fixes: 65a206c01e8e ("net/sched: Change act_api and act_xxx modules to use IDR")
Acked-by: Jamal Hadi Salim <jhs@mojatatu.com>
Signed-off-by: Davide Caratti <dcaratti@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/sched/act_vlan.c')
| -rw-r--r-- | net/sched/act_vlan.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/net/sched/act_vlan.c b/net/sched/act_vlan.c index c2914e9a4a6f..c49cb61adedf 100644 --- a/net/sched/act_vlan.c +++ b/net/sched/act_vlan.c @@ -195,7 +195,7 @@ static int tcf_vlan_init(struct net *net, struct nlattr *nla, ASSERT_RTNL(); p = kzalloc(sizeof(*p), GFP_KERNEL); if (!p) { - if (ovr) + if (ret == ACT_P_CREATED) tcf_idr_release(*a, bind); return -ENOMEM; } |