From: Herbert Xu <herbert@gondor.apana.org.au>
Date: Sun, 30 Nov 2014 18:03:31 +0800

On Sat, Nov 29, 2014 at 07:59:35AM +0800, Herbert Xu wrote:

quoted

On Fri, Nov 28, 2014 at 05:25:27PM -0200, Marcelo Ricardo Leitner wrote:

quoted

I saw there are tun updates on Dave's queue but none seemed to handle this.

I can't use current net-next
(799d2fff1858004526ad75d66a5dd8a5cce6ad40) on a kvm hypervisor
because tun got clogged somehow. Bisected down to:

commit e0b46d0ee9c240c7430a47e9b0365674d4a04522
Author: Herbert Xu [off-list ref]
Date:   Fri Nov 7 21:22:23 2014 +0800

Does this patch help?

Oops, there was an embarrassing typo in the patch which causes
it to not even build.  Here is the corrected version.

-- >8 --
Subject: tun: Fix GSO meta-data handling in tun_get_user
    
When we write the GSO meta-data in tun_get_user we end up advancing
the IO vector twice, thus exhausting the user buffer before we can
finish writing the packet.
    
Fixes: f5ff53b4d97c ("{macvtap,tun}_get_user(): switch to iov_iter")
Reported-by: Marcelo Ricardo Leitner <redacted>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

Applied, thanks.