Commit 62b4011f authored by Xiyu Yang's avatar Xiyu Yang Committed by David S. Miller

net/tls: Fix sk_psock refcnt leak when in tls_data_ready()

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

When tls_data_ready() 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
tls_data_ready(). When "psock->ingress_msg" is empty 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 all paths when "psock" is
not NULL.
Signed-off-by: default avatarXiyu Yang <xiyuyang19@fudan.edu.cn>
Signed-off-by: default avatarXin Tan <tanxin.ctf@gmail.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 4becb7ee
...@@ -2083,8 +2083,9 @@ static void tls_data_ready(struct sock *sk) ...@@ -2083,8 +2083,9 @@ static void tls_data_ready(struct sock *sk)
strp_data_ready(&ctx->strp); strp_data_ready(&ctx->strp);
psock = sk_psock_get(sk); psock = sk_psock_get(sk);
if (psock && !list_empty(&psock->ingress_msg)) { if (psock) {
ctx->saved_data_ready(sk); if (!list_empty(&psock->ingress_msg))
ctx->saved_data_ready(sk);
sk_psock_put(sk, psock); sk_psock_put(sk, psock);
} }
} }
......
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