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authorJaganath Kanakkassery <jaganath.k@samsung.com>2015-05-14 12:58:08 +0530
committerMarcel Holtmann <marcel@holtmann.org>2015-06-06 08:44:33 +0200
commit951b6a0717db97ce420547222647bcc40bf1eacd (patch)
treebbc263be24eaecadb4b15f060e026802bb57860c /net/bluetooth/rfcomm/sock.c
parent6be09b48ae8bcce8426877b5f89e6218ffb657b0 (diff)
Bluetooth: Fix potential NULL dereference in RFCOMM bind callback
addr can be NULL and it should not be dereferenced before NULL checking. Signed-off-by: Jaganath Kanakkassery <jaganath.k@samsung.com> Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Diffstat (limited to 'net/bluetooth/rfcomm/sock.c')
-rw-r--r--net/bluetooth/rfcomm/sock.c20
1 files changed, 12 insertions, 8 deletions
diff --git a/net/bluetooth/rfcomm/sock.c b/net/bluetooth/rfcomm/sock.c
index b2338e971b33..7511df72347f 100644
--- a/net/bluetooth/rfcomm/sock.c
+++ b/net/bluetooth/rfcomm/sock.c
@@ -334,16 +334,19 @@ static int rfcomm_sock_create(struct net *net, struct socket *sock,
static int rfcomm_sock_bind(struct socket *sock, struct sockaddr *addr, int addr_len)
{
- struct sockaddr_rc *sa = (struct sockaddr_rc *) addr;
+ struct sockaddr_rc sa;
struct sock *sk = sock->sk;
- int chan = sa->rc_channel;
- int err = 0;
-
- BT_DBG("sk %p %pMR", sk, &sa->rc_bdaddr);
+ int len, err = 0;
if (!addr || addr->sa_family != AF_BLUETOOTH)
return -EINVAL;
+ memset(&sa, 0, sizeof(sa));
+ len = min_t(unsigned int, sizeof(sa), addr_len);
+ memcpy(&sa, addr, len);
+
+ BT_DBG("sk %p %pMR", sk, &sa.rc_bdaddr);
+
lock_sock(sk);
if (sk->sk_state != BT_OPEN) {
@@ -358,12 +361,13 @@ static int rfcomm_sock_bind(struct socket *sock, struct sockaddr *addr, int addr
write_lock(&rfcomm_sk_list.lock);
- if (chan && __rfcomm_get_listen_sock_by_addr(chan, &sa->rc_bdaddr)) {
+ if (sa.rc_channel &&
+ __rfcomm_get_listen_sock_by_addr(sa.rc_channel, &sa.rc_bdaddr)) {
err = -EADDRINUSE;
} else {
/* Save source address */
- bacpy(&rfcomm_pi(sk)->src, &sa->rc_bdaddr);
- rfcomm_pi(sk)->channel = chan;
+ bacpy(&rfcomm_pi(sk)->src, &sa.rc_bdaddr);
+ rfcomm_pi(sk)->channel = sa.rc_channel;
sk->sk_state = BT_BOUND;
}

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