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nfc: fix memory leak in llcp_sock_connect()
commit 7574fcd upstream. In llcp_sock_connect(), use kmemdup to allocate memory for "llcp_sock->service_name". The memory is not released in the sock_unlink label of the subsequent failure branch. As a result, memory leakage occurs. fix CVE-2020-25672 Fixes: d646960 ("NFC: Initial LLCP support") Reported-by: "kiyin(尹亮)" <kiyin@tencent.com> Link: https://www.openwall.com/lists/oss-security/2020/11/01/1 Cc: <stable@vger.kernel.org> #v3.3 Signed-off-by: Xiaoming Ni <nixiaoming@huawei.com> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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