From: Xiaoming Ni nixiaoming@huawei.com
commit 7574fcdbdcb335763b6b322f6928dc0fd5730451 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: d646960f7986 ("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 --- net/nfc/llcp_sock.c | 2 ++ 1 file changed, 2 insertions(+)
--- a/net/nfc/llcp_sock.c +++ b/net/nfc/llcp_sock.c @@ -751,6 +751,8 @@ sock_unlink: nfc_llcp_local_put(llcp_sock->local);
nfc_llcp_sock_unlink(&local->connecting_sockets, sk); + kfree(llcp_sock->service_name); + llcp_sock->service_name = NULL;
put_dev: nfc_put_device(dev);