netdev - [PATCH bpf] bpf: net: Set sk_bpf_storage back to NULL for cloned sk

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Date:   Tue, 11 Jun 2019 14:45:57 -0700
From:   Martin KaFai Lau <kafai@...com>
To:     <bpf@...r.kernel.org>, <netdev@...r.kernel.org>
CC:     Alexei Starovoitov <ast@...com>,
        Daniel Borkmann <daniel@...earbox.net>,
        David Miller <davem@...emloft.net>, <kernel-team@...com>
Subject: [PATCH bpf] bpf: net: Set sk_bpf_storage back to NULL for cloned sk

The cloned sk should not carry its parent-listener's sk_bpf_storage.
This patch fixes it by setting it back to NULL.

Fixes: 6ac99e8f23d4 ("bpf: Introduce bpf sk local storage")
Signed-off-by: Martin KaFai Lau <kafai@...com>
---
 net/core/sock.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/net/core/sock.c b/net/core/sock.c
index 2b3701958486..d90fd04622e5 100644
--- a/net/core/sock.c
+++ b/net/core/sock.c
@@ -1850,6 +1850,9 @@ struct sock *sk_clone_lock(const struct sock *sk, const gfp_t priority)
 			goto out;
 		}
 		RCU_INIT_POINTER(newsk->sk_reuseport_cb, NULL);
+#ifdef CONFIG_BPF_SYSCALL
+		RCU_INIT_POINTER(newsk->sk_bpf_storage, NULL);
+#endif
 
 		newsk->sk_err	   = 0;
 		newsk->sk_err_soft = 0;
-- 
2.17.1