This is a note to let you know that I've just added the patch titled net/sched: cls_flower: fix only mask bit check in the validate_ct_state to the 5.10-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: net-sched-cls_flower-fix-only-mask-bit-check-in-the-.patch and it can be found in the queue-5.10 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. commit 90d15c677b21eab6e46ee25f9186154329da4376 Author: wenxu <wenxu@xxxxxxxxx> Date: Wed Mar 17 12:02:43 2021 +0800 net/sched: cls_flower: fix only mask bit check in the validate_ct_state [ Upstream commit afa536d8405a9ca36e45ba035554afbb8da27b82 ] The ct_state validate should not only check the mask bit and also check mask_bit & key_bit.. For the +new+est case example, The 'new' and 'est' bits should be set in both state_mask and state flags. Or the -new-est case also will be reject by kernel. When Openvswitch with two flows ct_state=+trk+new,action=commit,forward ct_state=+trk+est,action=forward A packet go through the kernel and the contrack state is invalid, The ct_state will be +trk-inv. Upcall to the ovs-vswitchd, the finally dp action will be drop with -new-est+trk. Fixes: 1bcc51ac0731 ("net/sched: cls_flower: Reject invalid ct_state flags rules") Fixes: 3aed8b63336c ("net/sched: cls_flower: validate ct_state for invalid and reply flags") Signed-off-by: wenxu <wenxu@xxxxxxxxx> Reviewed-by: Marcelo Ricardo Leitner <marcelo.leitner@xxxxxxxxx> Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> diff --git a/net/sched/cls_flower.c b/net/sched/cls_flower.c index 46c1b3e9f66a..14316ba9b3b3 100644 --- a/net/sched/cls_flower.c +++ b/net/sched/cls_flower.c @@ -1432,7 +1432,7 @@ static int fl_set_key_ct(struct nlattr **tb, &mask->ct_state, TCA_FLOWER_KEY_CT_STATE_MASK, sizeof(key->ct_state)); - err = fl_validate_ct_state(mask->ct_state, + err = fl_validate_ct_state(key->ct_state & mask->ct_state, tb[TCA_FLOWER_KEY_CT_STATE_MASK], extack); if (err)