diff mbox series

[5.4,23/90] net/tls: Fix sk_psock refcnt leak in bpf_exec_tx_verdict()

Message ID 20200513094411.100591611@linuxfoundation.org
State New
Headers show
Series None | expand

Commit Message

Greg KH May 13, 2020, 9:44 a.m. UTC 
From: Xiyu Yang <xiyuyang19@fudan.edu.cn>

[ Upstream commit 095f5614bfe16e5b3e191b34ea41b10d6fdd4ced ]

bpf_exec_tx_verdict() invokes sk_psock_get(), which returns a reference
of the specified sk_psock object to "psock" with increased refcnt.

When bpf_exec_tx_verdict() returns, local variable "psock" becomes
invalid, so the refcount should be decreased to keep refcount balanced.

The reference counting issue happens in one exception handling path of
bpf_exec_tx_verdict(). When "policy" equals to NULL but "psock" is not
NULL, the function forgets to decrease the refcnt increased by
sk_psock_get(), causing a refcnt leak.

Fix this issue by calling sk_psock_put() on this error path before
bpf_exec_tx_verdict() returns.

Signed-off-by: Xiyu Yang <xiyuyang19@fudan.edu.cn>
Signed-off-by: Xin Tan <tanxin.ctf@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 net/tls/tls_sw.c |    2 ++
 1 file changed, 2 insertions(+)
diff mbox series

Patch

--- a/net/tls/tls_sw.c
+++ b/net/tls/tls_sw.c
@@ -797,6 +797,8 @@  static int bpf_exec_tx_verdict(struct sk
 			*copied -= sk_msg_free(sk, msg);
 			tls_free_open_rec(sk);
 		}
+		if (psock)
+			sk_psock_put(sk, psock);
 		return err;
 	}
 more_data: