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net: fix double-free in bpf_lwt_xmit_reroute 

dst_output() frees skb when it fails (see, for example,
ip_finish_output2), so it must not be freed in this case.

Fixes: 3bd0b15281 ("bpf: add handling of BPF_LWT_REROUTE to lwt_bpf.c")
Signed-off-by: Peter Oskolkov <posk@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Peter Oskolkov 2019-02-23 18:25:01 -08:00 committed by David S. Miller
parent 186d93669f
commit bd16693f35
1 changed files with 1 additions and 1 deletions
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2
net/core/lwt_bpf.c
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@ -260,7 +260,7 @@ static int bpf_lwt_xmit_reroute(struct sk_buff *skb)
err = dst_output(dev_net(skb_dst(skb)->dev), skb->sk, skb);
if (unlikely(err))
goto err;
return err;
/* ip[6]_finish_output2 understand LWTUNNEL_XMIT_DONE */
return LWTUNNEL_XMIT_DONE;