diff options
| author | Xiaoming Ni <nixiaoming@huawei.com> | 2021-03-25 11:51:11 +0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-04-16 11:57:47 +0200 |
| commit | b1d5c07a3b597766bbf5bf61083cd65e72034144 (patch) | |
| tree | cba7cca3f86f4c4393937f3fdfe0501fdabdd11f /net/nfc | |
| parent | 538a6ff11516d38a61e237d2d2dc04c30c845fbe (diff) | |
nfc: fix refcount leak in llcp_sock_connect()
commit 8a4cd82d62b5ec7e5482333a72b58a4eea4979f0 upstream.
nfc_llcp_local_get() is invoked in llcp_sock_connect(),
but nfc_llcp_local_put() is not invoked in subsequent failure branches.
As a result, refcount leakage occurs.
To fix it, add calling nfc_llcp_local_put().
fix CVE-2020-25671
Fixes: c7aa12252f51 ("NFC: Take a reference on the LLCP local pointer when creating a socket")
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> #v3.6
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>
Diffstat (limited to 'net/nfc')
| -rw-r--r-- | net/nfc/llcp_sock.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/net/nfc/llcp_sock.c b/net/nfc/llcp_sock.c index f7891bd2040e..050f80d524f8 100644 --- a/net/nfc/llcp_sock.c +++ b/net/nfc/llcp_sock.c @@ -717,6 +717,7 @@ static int llcp_sock_connect(struct socket *sock, struct sockaddr *_addr, llcp_sock->local = nfc_llcp_local_get(local); llcp_sock->ssap = nfc_llcp_get_local_ssap(local); if (llcp_sock->ssap == LLCP_SAP_MAX) { + nfc_llcp_local_put(llcp_sock->local); ret = -ENOMEM; goto put_dev; } @@ -754,6 +755,7 @@ static int llcp_sock_connect(struct socket *sock, struct sockaddr *_addr, sock_unlink: nfc_llcp_put_ssap(local, llcp_sock->ssap); + nfc_llcp_local_put(llcp_sock->local); nfc_llcp_sock_unlink(&local->connecting_sockets, sk); |