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bpf: sockmap, duplicates release calls may NULL sk_prot

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It is possible to have multiple ULP tcp_release call paths in flight
if a sock is closed and simultaneously being removed from the sockmap
control path. The result would be setting the sk_prot to the saved
values on the first iteration and then on the second iteration setting
the value to NULL.

This patch resolves this by ensuring we only reset the sk_prot pointer
if we have a valid saved state to set.

Fixes: 4f738adba3 ("bpf: create tcp_bpf_ulp allowing BPF to monitor socket TX/RX data")
Signed-off-by: John Fastabend <john.fastabend@gmail.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
This commit is contained in:
John Fastabend 2018-04-02 12:50:52 -07:00 committed by Daniel Borkmann
parent 820ed3fb2e
commit 0e94d87fcf
1 changed files with 4 additions and 2 deletions
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6
kernel/bpf/sockmap.c
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@ -182,8 +182,10 @@ static void bpf_tcp_release(struct sock *sk)
psock->cork = NULL;
}
sk->sk_prot = psock->sk_proto;
psock->sk_proto = NULL;
if (psock->sk_proto) {
sk->sk_prot = psock->sk_proto;
psock->sk_proto = NULL;
}
out:
rcu_read_unlock();
}