4.19-stable review patch. If anyone has any objections, please let me know.
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From: Davide Caratti dcaratti@redhat.com
[ Upstream commit 6191da98062d25276a3b88fb2a94dcbcfb3ea65d ]
when act_skbedit was converted to use RCU in the data plane, we added an error path, but we forgot to drop the action refcount in case of failure during a 'replace' operation:
# tc actions add action skbedit ptype otherhost pass index 100 # tc action show action skbedit total acts 1
action order 0: skbedit ptype otherhost pass index 100 ref 1 bind 0 # tc actions replace action skbedit ptype otherhost drop index 100 RTNETLINK answers: Cannot allocate memory We have an error talking to the kernel # tc action show action skbedit total acts 1
action order 0: skbedit ptype otherhost pass index 100 ref 2 bind 0
Ensure we call tcf_idr_release(), in case 'params_new' allocation failed, also when the action is being replaced.
Fixes: c749cdda9089 ("net/sched: act_skbedit: don't use spinlock in the data path") Signed-off-by: Davide Caratti dcaratti@redhat.com Signed-off-by: David S. Miller davem@davemloft.net Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- net/sched/act_skbedit.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-)
--- a/net/sched/act_skbedit.c +++ b/net/sched/act_skbedit.c @@ -191,8 +191,7 @@ static int tcf_skbedit_init(struct net *
params_new = kzalloc(sizeof(*params_new), GFP_KERNEL); if (unlikely(!params_new)) { - if (ret == ACT_P_CREATED) - tcf_idr_release(*a, bind); + tcf_idr_release(*a, bind); return -ENOMEM; }