commit 63b9ab65bd76e5de6479bb14b4014b64aa1a317a
author Jason Wang <jasowang@redhat.com> Fri Oct 27 11:05:44 2017 +0800
committer David S. Miller <davem@davemloft.net> Sat Oct 28 19:05:28 2017 +0900
tree 3822be64ed1349f2d394198b022fe482ddaa47e7
parent 8ab190fbe96178449d8195c3582aa10ce684c386

tuntap: properly align skb->head before building skb

An unaligned alloc_frag->offset caused by previous allocation will
result an unaligned skb->head. This will lead unaligned
skb_shared_info and then unaligned dataref which requires to be
aligned for accessing on some architecture. Fix this by aligning
alloc_frag->offset before the frag refilling.

Fixes: 0bbd7dad34f8 ("tun: make tun_build_skb() thread safe")
Cc: Eric Dumazet <edumazet@google.com>
Cc: Willem de Bruijn <willemdebruijn.kernel@gmail.com>
Cc: Wei Wei <dotweiba@gmail.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Reported-by: Wei Wei <dotweiba@gmail.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>