4.20-stable review patch. If anyone has any objections, please let me know.
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From: Davide Caratti dcaratti@redhat.com
[ Upstream commit 9174c3df1cd181c14913138d50ccbe539bb08335 ]
running the following TDC test cases:
7afc - Replace tunnel_key set action with all parameters 364d - Replace tunnel_key set action with all parameters and cookie
it's possible to trigger kmemleak warnings like:
unreferenced object 0xffff94797127ab40 (size 192): comm "tc", pid 3248, jiffies 4300565293 (age 1006.862s) hex dump (first 32 bytes): 00 00 00 00 00 00 00 00 c0 93 f9 8a ff ff ff ff ................ 41 84 ee 89 ff ff ff ff 00 00 00 00 00 00 00 00 A............... backtrace: [<000000001e85b61c>] tunnel_key_init+0x31d/0x820 [act_tunnel_key] [<000000007f3f6ee7>] tcf_action_init_1+0x384/0x4c0 [<00000000e89e3ded>] tcf_action_init+0x12b/0x1a0 [<00000000c1c8c0f8>] tcf_action_add+0x73/0x170 [<0000000095a9fc28>] tc_ctl_action+0x122/0x160 [<000000004bebeac5>] rtnetlink_rcv_msg+0x263/0x2d0 [<000000009fd862dd>] netlink_rcv_skb+0x4a/0x110 [<00000000b55199e7>] netlink_unicast+0x1a0/0x250 [<000000004996cd21>] netlink_sendmsg+0x2c1/0x3c0 [<000000004d6a94b4>] sock_sendmsg+0x36/0x40 [<000000005d9f0208>] ___sys_sendmsg+0x280/0x2f0 [<00000000dec19023>] __sys_sendmsg+0x5e/0xa0 [<000000004b82ac81>] do_syscall_64+0x5b/0x180 [<00000000a0f1209a>] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [<000000002926b2ab>] 0xffffffffffffffff
when the tunnel_key action is replaced, the kernel forgets to release the dst metadata: ensure they are released by tunnel_key_init(), the same way it's done in tunnel_key_release().
Fixes: d0f6dd8a914f4 ("net/sched: Introduce act_tunnel_key") Signed-off-by: Davide Caratti dcaratti@redhat.com Acked-by: Cong Wang xiyou.wangcong@gmail.com Signed-off-by: David S. Miller davem@davemloft.net Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- net/sched/act_tunnel_key.c | 19 +++++++++++-------- 1 file changed, 11 insertions(+), 8 deletions(-)
--- a/net/sched/act_tunnel_key.c +++ b/net/sched/act_tunnel_key.c @@ -197,6 +197,15 @@ static const struct nla_policy tunnel_ke [TCA_TUNNEL_KEY_ENC_TTL] = { .type = NLA_U8 }, };
+static void tunnel_key_release_params(struct tcf_tunnel_key_params *p) +{ + if (!p) + return; + if (p->tcft_action == TCA_TUNNEL_KEY_ACT_SET) + dst_release(&p->tcft_enc_metadata->dst); + kfree_rcu(p, rcu); +} + static int tunnel_key_init(struct net *net, struct nlattr *nla, struct nlattr *est, struct tc_action **a, int ovr, int bind, bool rtnl_held, @@ -360,8 +369,7 @@ static int tunnel_key_init(struct net *n rcu_swap_protected(t->params, params_new, lockdep_is_held(&t->tcf_lock)); spin_unlock_bh(&t->tcf_lock); - if (params_new) - kfree_rcu(params_new, rcu); + tunnel_key_release_params(params_new);
if (ret == ACT_P_CREATED) tcf_idr_insert(tn, *a); @@ -385,12 +393,7 @@ static void tunnel_key_release(struct tc struct tcf_tunnel_key_params *params;
params = rcu_dereference_protected(t->params, 1); - if (params) { - if (params->tcft_action == TCA_TUNNEL_KEY_ACT_SET) - dst_release(¶ms->tcft_enc_metadata->dst); - - kfree_rcu(params, rcu); - } + tunnel_key_release_params(params); }
static int tunnel_key_geneve_opts_dump(struct sk_buff *skb,