From fceb6435e85298f747fee938415057af837f5a8a Mon Sep 17 00:00:00 2001 From: Johannes Berg Date: Wed, 12 Apr 2017 14:34:07 +0200 Subject: netlink: pass extended ACK struct to parsing functions Pass the new extended ACK reporting struct to all of the generic netlink parsing functions. For now, pass NULL in almost all callers (except for some in the core.) Signed-off-by: Johannes Berg Signed-off-by: David S. Miller --- net/sched/cls_basic.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'net/sched/cls_basic.c') diff --git a/net/sched/cls_basic.c b/net/sched/cls_basic.c index 5877f6061b57..422414f16b38 100644 --- a/net/sched/cls_basic.c +++ b/net/sched/cls_basic.c @@ -174,7 +174,7 @@ static int basic_change(struct net *net, struct sk_buff *in_skb, return -EINVAL; err = nla_parse_nested(tb, TCA_BASIC_MAX, tca[TCA_OPTIONS], - basic_policy); + basic_policy, NULL); if (err < 0) return err; -- cgit From 763dbf6328e41de7a55851baf5ee49e367552531 Mon Sep 17 00:00:00 2001 From: WANG Cong Date: Wed, 19 Apr 2017 14:21:21 -0700 Subject: net_sched: move the empty tp check from ->destroy() to ->delete() We could have a race condition where in ->classify() path we dereference tp->root and meanwhile a parallel ->destroy() makes it a NULL. Daniel cured this bug in commit d936377414fa ("net, sched: respect rcu grace period on cls destruction"). This happens when ->destroy() is called for deleting a filter to check if we are the last one in tp, this tp is still linked and visible at that time. The root cause of this problem is the semantic of ->destroy(), it does two things (for non-force case): 1) check if tp is empty 2) if tp is empty we could really destroy it and its caller, if cares, needs to check its return value to see if it is really destroyed. Therefore we can't unlink tp unless we know it is empty. As suggested by Daniel, we could actually move the test logic to ->delete() so that we can safely unlink tp after ->delete() tells us the last one is just deleted and before ->destroy(). Fixes: 1e052be69d04 ("net_sched: destroy proto tp when all filters are gone") Cc: Roi Dayan Cc: Daniel Borkmann Cc: John Fastabend Cc: Jamal Hadi Salim Signed-off-by: Cong Wang Acked-by: Daniel Borkmann Signed-off-by: David S. Miller --- net/sched/cls_basic.c | 10 ++++------ 1 file changed, 4 insertions(+), 6 deletions(-) (limited to 'net/sched/cls_basic.c') diff --git a/net/sched/cls_basic.c b/net/sched/cls_basic.c index 422414f16b38..c4fd63a068f9 100644 --- a/net/sched/cls_basic.c +++ b/net/sched/cls_basic.c @@ -93,30 +93,28 @@ static void basic_delete_filter(struct rcu_head *head) kfree(f); } -static bool basic_destroy(struct tcf_proto *tp, bool force) +static void basic_destroy(struct tcf_proto *tp) { struct basic_head *head = rtnl_dereference(tp->root); struct basic_filter *f, *n; - if (!force && !list_empty(&head->flist)) - return false; - list_for_each_entry_safe(f, n, &head->flist, link) { list_del_rcu(&f->link); tcf_unbind_filter(tp, &f->res); call_rcu(&f->rcu, basic_delete_filter); } kfree_rcu(head, rcu); - return true; } -static int basic_delete(struct tcf_proto *tp, unsigned long arg) +static int basic_delete(struct tcf_proto *tp, unsigned long arg, bool *last) { + struct basic_head *head = rtnl_dereference(tp->root); struct basic_filter *f = (struct basic_filter *) arg; list_del_rcu(&f->link); tcf_unbind_filter(tp, &f->res); call_rcu(&f->rcu, basic_delete_filter); + *last = list_empty(&head->flist); return 0; } -- cgit