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: 3bd0b152 ("bpf: add handling of BPF_LWT_REROUTE to lwt_bpf.c") Signed-off-by: NPeter Oskolkov <posk@google.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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