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| author | Xiyu Yang <xiyuyang19@fudan.edu.cn> | 2020-04-25 15:54:37 +0300 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2020-04-27 21:17:16 +0300 |
| commit | 095f5614bfe16e5b3e191b34ea41b10d6fdd4ced (patch) | |
| tree | a5468ac927f1ac27565b6da62f24d080eb95126e /net/tls/tls_sw.c | |
| parent | 6de556c31061e3b9c36546ffaaac5fdb679a2f14 (diff) | |
| download | linux-095f5614bfe16e5b3e191b34ea41b10d6fdd4ced.tar.xz | |
net/tls: Fix sk_psock refcnt leak in bpf_exec_tx_verdict()
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>
Diffstat (limited to 'net/tls/tls_sw.c')
| -rw-r--r-- | net/tls/tls_sw.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/net/tls/tls_sw.c b/net/tls/tls_sw.c index c98e602a1a2d..704313dd082f 100644 --- a/net/tls/tls_sw.c +++ b/net/tls/tls_sw.c @@ -800,6 +800,8 @@ static int bpf_exec_tx_verdict(struct sk_msg *msg, struct sock *sk, *copied -= sk_msg_free(sk, msg); tls_free_open_rec(sk); } + if (psock) + sk_psock_put(sk, psock); return err; } more_data: |