[PATCH net-next 2/2] xfrm: Fix unaligned access in xfrm_notify_sa() for DELSA

From: Sowmini Varadhan
Date: Mon Oct 19 2015 - 17:24:59 EST


On sparc, deleting established SAs (e.g., by restarting ipsec
at the peer) results in unaligned access messages via
xfrm_del_sa -> km_state_notify -> xfrm_send_state_notify().
Use an aligned pointer to xfrm_usersa_info for this case.

Signed-off-by: Sowmini Varadhan <sowmini.varadhan@xxxxxxxxxx>
---
net/xfrm/xfrm_user.c | 2 +-
1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/net/xfrm/xfrm_user.c b/net/xfrm/xfrm_user.c
index a8de9e3..158ef4a 100644
--- a/net/xfrm/xfrm_user.c
+++ b/net/xfrm/xfrm_user.c
@@ -2659,7 +2659,7 @@ static int xfrm_notify_sa(struct xfrm_state *x, const struct km_event *c)
if (attr == NULL)
goto out_free_skb;

- p = nla_data(attr);
+ p = PTR_ALIGN(nla_data(attr), __alignof__(*p));
}
err = copy_to_user_state_extra(x, p, skb);
if (err)
--
1.7.1

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