diff options
| author | Xiaoming Ni <nixiaoming@huawei.com> | 2021-03-25 06:51:13 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-04-16 12:57:47 +0300 |
| commit | 892e1f065c1b3c99a12a1a41683f9ddbc22abb3e (patch) | |
| tree | a30c7207ceac72d2aecc9b92a1e4929383dd310d /net/nfc/llcp_sock.c | |
| parent | 02b99cae71335f9f38d0a164ffe3a7a1328f44fc (diff) | |
| download | linux-892e1f065c1b3c99a12a1a41683f9ddbc22abb3e.tar.xz | |
nfc: Avoid endless loops caused by repeated llcp_sock_connect()
commit 4b5db93e7f2afbdfe3b78e37879a85290187e6f1 upstream.
When sock_wait_state() returns -EINPROGRESS, "sk->sk_state" is
LLCP_CONNECTING. In this case, llcp_sock_connect() is repeatedly invoked,
nfc_llcp_sock_link() will add sk to local->connecting_sockets twice.
sk->sk_node->next will point to itself, that will make an endless loop
and hang-up the system.
To fix it, check whether sk->sk_state is LLCP_CONNECTING in
llcp_sock_connect() to avoid repeated invoking.
Fixes: b4011239a08e ("NFC: llcp: Fix non blocking sockets connections")
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> #v3.11
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/llcp_sock.c')
| -rw-r--r-- | net/nfc/llcp_sock.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/net/nfc/llcp_sock.c b/net/nfc/llcp_sock.c index 413544ebe8ef..0c2c88a2f0b0 100644 --- a/net/nfc/llcp_sock.c +++ b/net/nfc/llcp_sock.c @@ -686,6 +686,10 @@ static int llcp_sock_connect(struct socket *sock, struct sockaddr *_addr, ret = -EISCONN; goto error; } + if (sk->sk_state == LLCP_CONNECTING) { + ret = -EINPROGRESS; + goto error; + } dev = nfc_get_device(addr->dev_idx); if (dev == NULL) { |