From: Wei Yongjun <weiyongjun1@huawei.com>
Date: Sat, 27 Oct 2018 06:12:06 +0000 (+0000)
Subject: xfrm: Fix error return code in xfrm_output_one()
X-Git-Tag: android-x86-8.1-r1~1^2~1^2~134
X-Git-Url: http://git.osdn.net/view?a=commitdiff_plain;h=34a2f36c0115b52c316a10c53472fe6dfc2d17ea;p=android-x86%2Fkernel.git

xfrm: Fix error return code in xfrm_output_one()

[ Upstream commit 533555e5cbb6aa2d77598917871ae5b579fe724b ]

xfrm_output_one() does not return a error code when there is
no dst_entry attached to the skb, it is still possible crash
with a NULL pointer dereference in xfrm_output_resume(). Fix
it by return error code -EHOSTUNREACH.

Fixes: 9e1437937807 ("xfrm: Fix NULL pointer dereference when skb_dst_force clears the dst_entry.")
Signed-off-by: Wei Yongjun <weiyongjun1@huawei.com>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---

diff --git a/net/xfrm/xfrm_output.c b/net/xfrm/xfrm_output.c
index 261995d37ced..6d20fbcde000 100644
--- a/net/xfrm/xfrm_output.c
+++ b/net/xfrm/xfrm_output.c
@@ -102,6 +102,7 @@ static int xfrm_output_one(struct sk_buff *skb, int err)
 		skb_dst_force(skb);
 		if (!skb_dst(skb)) {
 			XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTERROR);
+			err = -EHOSTUNREACH;
 			goto error_nolock;
 		}