| Message ID | 155775717732.22311.13248108248808306711.stgit@john-XPS-13-9360 |
|---|---|
| State | Accepted |
| Delegated to: | BPF Maintainers |
| Headers | show |
| Series | sockmap fixes | expand |
diff --git a/net/ipv4/tcp_bpf.c b/net/ipv4/tcp_bpf.c index 1bb7321a256d..4a619c85daed 100644 --- a/net/ipv4/tcp_bpf.c +++ b/net/ipv4/tcp_bpf.c @@ -528,8 +528,6 @@ static void tcp_bpf_remove(struct sock *sk, struct sk_psock *psock) { struct sk_psock_link *link; - sk_psock_cork_free(psock); - __sk_psock_purge_ingress_msg(psock); while ((link = sk_psock_link_pop(psock))) { sk_psock_unlink(sk, link); sk_psock_free_link(link);
In tcp bpf remove we free the cork list and purge the ingress msg list. However we do this before the ref count reaches zero so it could be possible some other access is in progress. In this case (tcp close and/or tcp_unhash) we happen to also hold the sock lock so no path exists but lets fix it otherwise it is extremely fragile and breaks the reference counting rules. Also we already check the cork list and ingress msg queue and free them once the ref count reaches zero so its wasteful to check twice. Fixes: 604326b41a6fb ("bpf, sockmap: convert to generic sk_msg interface") Signed-off-by: John Fastabend <john.fastabend@gmail.com> --- net/ipv4/tcp_bpf.c | 2 -- 1 file changed, 2 deletions(-)