This is a note to let you know that I've just added the patch titled
cls_u32: add missing RCU annotation.
to the 4.9-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git%3Ba=su...
The filename of the patch is: cls_u32-add-missing-rcu-annotation.patch and it can be found in the queue-4.9 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree, please let stable@vger.kernel.org know about it.
From foo@baz Tue Feb 6 12:42:23 PST 2018
From: Paolo Abeni pabeni@redhat.com Date: Fri, 2 Feb 2018 16:02:22 +0100 Subject: cls_u32: add missing RCU annotation.
From: Paolo Abeni pabeni@redhat.com
[ Upstream commit 058a6c033488494a6b1477b05fe8e1a16e344462 ]
In a couple of points of the control path, n->ht_down is currently accessed without the required RCU annotation. The accesses are safe, but sparse complaints. Since we already held the rtnl lock, let use rtnl_dereference().
Fixes: a1b7c5fd7fe9 ("net: sched: add cls_u32 offload hooks for netdevs") Fixes: de5df63228fc ("net: sched: cls_u32 changes to knode must appear atomic to readers") Signed-off-by: Paolo Abeni pabeni@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/cls_u32.c | 12 +++++++----- 1 file changed, 7 insertions(+), 5 deletions(-)
--- a/net/sched/cls_u32.c +++ b/net/sched/cls_u32.c @@ -496,6 +496,7 @@ static void u32_clear_hw_hnode(struct tc static int u32_replace_hw_knode(struct tcf_proto *tp, struct tc_u_knode *n, u32 flags) { + struct tc_u_hnode *ht = rtnl_dereference(n->ht_down); struct net_device *dev = tp->q->dev_queue->dev; struct tc_cls_u32_offload u32_offload = {0}; struct tc_to_netdev offload; @@ -520,7 +521,7 @@ static int u32_replace_hw_knode(struct t offload.cls_u32->knode.sel = &n->sel; offload.cls_u32->knode.exts = &n->exts; if (n->ht_down) - offload.cls_u32->knode.link_handle = n->ht_down->handle; + offload.cls_u32->knode.link_handle = ht->handle;
err = dev->netdev_ops->ndo_setup_tc(dev, tp->q->handle, tp->protocol, &offload); @@ -788,8 +789,9 @@ static void u32_replace_knode(struct tcf static struct tc_u_knode *u32_init_knode(struct tcf_proto *tp, struct tc_u_knode *n) { - struct tc_u_knode *new; + struct tc_u_hnode *ht = rtnl_dereference(n->ht_down); struct tc_u32_sel *s = &n->sel; + struct tc_u_knode *new;
new = kzalloc(sizeof(*n) + s->nkeys*sizeof(struct tc_u32_key), GFP_KERNEL); @@ -807,11 +809,11 @@ static struct tc_u_knode *u32_init_knode new->fshift = n->fshift; new->res = n->res; new->flags = n->flags; - RCU_INIT_POINTER(new->ht_down, n->ht_down); + RCU_INIT_POINTER(new->ht_down, ht);
/* bump reference count as long as we hold pointer to structure */ - if (new->ht_down) - new->ht_down->refcnt++; + if (ht) + ht->refcnt++;
#ifdef CONFIG_CLS_U32_PERF /* Statistics may be incremented by readers during update
Patches currently in stable-queue which might be from pabeni@redhat.com are
queue-4.9/cls_u32-add-missing-rcu-annotation.patch