Patch "sctp: sctp gso should set feature with NETIF_F_SG when calling skb_segment" has been added to the 4.9-stable tree

[<gregkh@linuxfoundation.org>]

This is a note to let you know that I've just added the patch titled

    sctp: sctp gso should set feature with NETIF_F_SG when calling skb_segment

to the 4.9-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:
     sctp-sctp-gso-should-set-feature-with-netif_f_sg-when-calling-skb_segment.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 Thu Jun 15 16:23:30 CEST 2017
From: Xin Long <lucien.xin@gmail.com>
Date: Tue, 24 Jan 2017 14:05:16 +0800
Subject: sctp: sctp gso should set feature with NETIF_F_SG when calling skb_segment

From: Xin Long <lucien.xin@gmail.com>


[ Upstream commit 5207f3996338e1db71363fe381c81aaf1e54e4e3 ]

Now sctp gso puts segments into skb's frag_list, then processes these
segments in skb_segment. But skb_segment handles them only when gs is
enabled, as it's in the same branch with skb's frags.

Although almost all the NICs support sg other than some old ones, but
since commit 1e16aa3ddf86 ("net: gso: use feature flag argument in all
protocol gso handlers"), features &= skb->dev->hw_enc_features, and
xfrm_output_gso call skb_segment with features = 0, which means sctp
gso would call skb_segment with sg = 0, and skb_segment would not work
as expected.

This patch is to fix it by setting features param with NETIF_F_SG when
calling skb_segment so that it can go the right branch to process the
skb's frag_list.

Signed-off-by: Xin Long <lucien.xin@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 net/sctp/offload.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/net/sctp/offload.c
+++ b/net/sctp/offload.c
@@ -68,7 +68,7 @@ static struct sk_buff *sctp_gso_segment(
 		goto out;
 	}
 
-	segs = skb_segment(skb, features | NETIF_F_HW_CSUM);
+	segs = skb_segment(skb, features | NETIF_F_HW_CSUM | NETIF_F_SG);
 	if (IS_ERR(segs))
 		goto out;
 


Patches currently in stable-queue which might be from lucien.xin@gmail.com are

queue-4.9/sctp-sctp-gso-should-set-feature-with-netif_f_sg-when-calling-skb_segment.patch
queue-4.9/sctp-sctp_addr_id2transport-should-verify-the-addr-before-looking-up-assoc.patch