This is a note to let you know that I've just added the patch titled net: skb_needs_check() accepts CHECKSUM_NONE for tx to the 4.4-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-skb_needs_check-accepts-checksum_none-for-tx.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@xxxxxxxxxxxxxxx> know about it. >From 6e7bc478c9a006c701c14476ec9d389a484b4864 Mon Sep 17 00:00:00 2001 From: Eric Dumazet <edumazet@xxxxxxxxxx> Date: Fri, 3 Feb 2017 14:29:42 -0800 Subject: net: skb_needs_check() accepts CHECKSUM_NONE for tx From: Eric Dumazet <edumazet@xxxxxxxxxx> commit 6e7bc478c9a006c701c14476ec9d389a484b4864 upstream. My recent change missed fact that UFO would perform a complete UDP checksum before segmenting in frags. In this case skb->ip_summed is set to CHECKSUM_NONE. We need to add this valid case to skb_needs_check() Fixes: b2504a5dbef3 ("net: reduce skb_warn_bad_offload() noise") Signed-off-by: Eric Dumazet <edumazet@xxxxxxxxxx> Cc: Willem de Bruijn <willemb@xxxxxxxxxx> Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- net/core/dev.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) --- a/net/core/dev.c +++ b/net/core/dev.c @@ -2550,9 +2550,10 @@ EXPORT_SYMBOL(skb_mac_gso_segment); static inline bool skb_needs_check(struct sk_buff *skb, bool tx_path) { if (tx_path) - return skb->ip_summed != CHECKSUM_PARTIAL; - else - return skb->ip_summed == CHECKSUM_NONE; + return skb->ip_summed != CHECKSUM_PARTIAL && + skb->ip_summed != CHECKSUM_NONE; + + return skb->ip_summed == CHECKSUM_NONE; } /** Patches currently in stable-queue which might be from edumazet@xxxxxxxxxx are queue-4.4/net-skb_needs_check-accepts-checksum_none-for-tx.patch queue-4.4/net-reduce-skb_warn_bad_offload-noise.patch