From: Xiyu Yang xiyuyang19@fudan.edu.cn
[ Upstream commit 62b4011fa7bef9fa00a6aeec26e69685dc1cc21e ]
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: 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 | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-)
--- a/net/tls/tls_sw.c +++ b/net/tls/tls_sw.c @@ -2078,8 +2078,9 @@ static void tls_data_ready(struct sock * strp_data_ready(&ctx->strp);
psock = sk_psock_get(sk); - if (psock && !list_empty(&psock->ingress_msg)) { - ctx->saved_data_ready(sk); + if (psock) { + if (!list_empty(&psock->ingress_msg)) + ctx->saved_data_ready(sk); sk_psock_put(sk, psock); } }