From: Roman Kapl code@rkapl.cz
[ Upstream commit d7aa04a5e82b4f254d306926c81eae8df69e5200 ]
If you flush (delete) a filter chain other than chain 0 (such as when deleting the device), the kernel may run into a use-after-free. The chain refcount must not be decremented unless we are sure we are done with the chain.
To reproduce the bug, run: ip link add dtest type dummy tc qdisc add dev dtest ingress tc filter add dev dtest chain 1 parent ffff: flower ip link del dtest
Introduced in: commit f93e1cdcf42c ("net/sched: fix filter flushing"), but unless you have KAsan or luck, you won't notice it until commit 0dadc117ac8b ("cls_flower: use tcf_exts_get_net() before call_rcu()")
Fixes: f93e1cdcf42c ("net/sched: fix filter flushing") Acked-by: Jiri Pirko jiri@mellanox.com Signed-off-by: Roman Kapl code@rkapl.cz Signed-off-by: David S. Miller davem@davemloft.net --- net/sched/cls_api.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-)
diff --git a/net/sched/cls_api.c b/net/sched/cls_api.c index ecbb019efcbd..1451a56a8f93 100644 --- a/net/sched/cls_api.c +++ b/net/sched/cls_api.c @@ -197,14 +197,15 @@ static struct tcf_chain *tcf_chain_create(struct tcf_block *block,
static void tcf_chain_flush(struct tcf_chain *chain) { - struct tcf_proto *tp; + struct tcf_proto *tp = rtnl_dereference(chain->filter_chain);
if (chain->p_filter_chain) RCU_INIT_POINTER(*chain->p_filter_chain, NULL); - while ((tp = rtnl_dereference(chain->filter_chain)) != NULL) { + while (tp) { RCU_INIT_POINTER(chain->filter_chain, tp->next); - tcf_chain_put(chain); tcf_proto_destroy(tp); + tp = rtnl_dereference(chain->filter_chain); + tcf_chain_put(chain); } }