This is a note to let you know that I've just added the patch titled
netfilter: nft_queue: use raw_smp_processor_id()
to the 4.4-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: netfilter-nft_queue-use-raw_smp_processor_id.patch and it can be found in the queue-4.4 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 Nov 28 10:56:34 CET 2017
From: Pablo Neira Ayuso pablo@netfilter.org Date: Sun, 11 Dec 2016 20:46:51 +0100 Subject: netfilter: nft_queue: use raw_smp_processor_id()
From: Pablo Neira Ayuso pablo@netfilter.org
[ Upstream commit c2e756ff9e699865d294cdc112acfc36419cf5cc ]
Using smp_processor_id() causes splats with PREEMPT_RCU:
[19379.552780] BUG: using smp_processor_id() in preemptible [00000000] code: ping/32389 [19379.552793] caller is debug_smp_processor_id+0x17/0x19 [...] [19379.552823] Call Trace: [19379.552832] [<ffffffff81274e9e>] dump_stack+0x67/0x90 [19379.552837] [<ffffffff8129a4d4>] check_preemption_disabled+0xe5/0xf5 [19379.552842] [<ffffffff8129a4fb>] debug_smp_processor_id+0x17/0x19 [19379.552849] [<ffffffffa07c42dd>] nft_queue_eval+0x35/0x20c [nft_queue]
No need to disable preemption since we only fetch the numeric value, so let's use raw_smp_processor_id() instead.
Signed-off-by: Pablo Neira Ayuso pablo@netfilter.org Signed-off-by: Sasha Levin alexander.levin@verizon.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- net/netfilter/nft_queue.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/net/netfilter/nft_queue.c +++ b/net/netfilter/nft_queue.c @@ -37,7 +37,7 @@ static void nft_queue_eval(const struct
if (priv->queues_total > 1) { if (priv->flags & NFT_QUEUE_FLAG_CPU_FANOUT) { - int cpu = smp_processor_id(); + int cpu = raw_smp_processor_id();
queue = priv->queuenum + cpu % priv->queues_total; } else {
Patches currently in stable-queue which might be from pablo@netfilter.org are
queue-4.4/netfilter-nf_tables-fix-oob-access.patch queue-4.4/netfilter-nft_queue-use-raw_smp_processor_id.patch