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mctp: Fix check for dev_hard_header() result 

[ Upstream commit 60be976ac45137657b7b505d7e0d44d0e51accb7 ]

dev_hard_header() returns the length of the header, so
we need to test for negative errors rather than non-zero.

Fixes: 889b7da23a ("mctp: Add initial routing framework")
Signed-off-by: Matt Johnston <matt@codeconstruct.com.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Matt Johnston 2022-04-01 10:48:42 +08:00 committed by Greg Kroah-Hartman
parent 40229b2977
commit 71d28e5073
1 changed files with 1 additions and 1 deletions
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2
net/mctp/route.c
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@ -396,7 +396,7 @@ static int mctp_route_output(struct mctp_route *route, struct sk_buff *skb)
rc = dev_hard_header(skb, skb->dev, ntohs(skb->protocol),
daddr, skb->dev->dev_addr, skb->len);
if (rc) {
if (rc < 0) {
kfree_skb(skb);
return -EHOSTUNREACH;
}