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xfrm: Fix error return code in xfrm_output_one()

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[ Upstream commit 533555e5cb ]

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: 9e14379378 ("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>
This commit is contained in:
Wei Yongjun 2018-10-27 06:12:06 +00:00 committed by Greg Kroah-Hartman
parent 7519ffa911
commit 34a2f36c01
1 changed files with 1 additions and 0 deletions
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1
net/xfrm/xfrm_output.c
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@ -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;
}