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ipv4: Don't override return code from ip_route_input_noref()

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After ip_route_input() calls ip_route_input_noref(), another
check on skb_dst() is done, but if this fails, we shouldn't
override the return code from ip_route_input_noref(), as it
could have been more specific (i.e. -EHOSTUNREACH).

This also saves one call to skb_dst_force_safe() and one to
skb_dst() in case the ip_route_input_noref() check fails.

Reported-by: Sabrina Dubroca <sdubroca@redhat.com>
Fixes: 9df16efadd ("ipv4: call dst_hold_safe() properly")
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
Acked-by: Wei Wang <weiwan@google.com>
Acked-by: Sabrina Dubroca <sd@queasysnail.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Stefano Brivio 2017-08-31 18:11:41 +02:00 committed by David S. Miller
parent 138e4ad67a
commit 64327fc811
1 changed files with 4 additions and 3 deletions
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7
include/net/route.h
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@ -189,10 +189,11 @@ static inline int ip_route_input(struct sk_buff *skb, __be32 dst, __be32 src,
rcu_read_lock();
err = ip_route_input_noref(skb, dst, src, tos, devin);
if (!err)
if (!err) {
skb_dst_force_safe(skb);
if (!skb_dst(skb))
err = -EINVAL;
if (!skb_dst(skb))
err = -EINVAL;
}
rcu_read_unlock();
return err;