4.19-stable review patch. If anyone has any objections, please let me know.
------------------
[ 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@xxxxxxxxxx>
Signed-off-by: Steffen Klassert <steffen.klassert@xxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
net/xfrm/xfrm_output.c | 1 +
1 file changed, 1 insertion(+)
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;
}
--
2.19.1
