Commit d2ecfa76 authored by Mateusz Jurczyk's avatar Mateusz Jurczyk Committed by Marcel Holtmann

Bluetooth: Add sockaddr length checks before accessing sa_family in bind and connect handlers

Verify that the caller-provided sockaddr structure is large enough to
contain the sa_family field, before accessing it in bind() and connect()
handlers of the Bluetooth sockets. Since neither syscall enforces a minimum
size of the corresponding memory region, very short sockaddrs (zero or one
byte long) result in operating on uninitialized memory while referencing
sa_family.
Signed-off-by: default avatarMateusz Jurczyk <mjurczyk@google.com>
Signed-off-by: default avatarMarcel Holtmann <marcel@holtmann.org>
parent 29e2dd0d
......@@ -87,7 +87,8 @@ static int l2cap_sock_bind(struct socket *sock, struct sockaddr *addr, int alen)
BT_DBG("sk %p", sk);
if (!addr || addr->sa_family != AF_BLUETOOTH)
if (!addr || alen < offsetofend(struct sockaddr, sa_family) ||
addr->sa_family != AF_BLUETOOTH)
return -EINVAL;
memset(&la, 0, sizeof(la));
......@@ -181,7 +182,7 @@ static int l2cap_sock_connect(struct socket *sock, struct sockaddr *addr,
BT_DBG("sk %p", sk);
if (!addr || alen < sizeof(addr->sa_family) ||
if (!addr || alen < offsetofend(struct sockaddr, sa_family) ||
addr->sa_family != AF_BLUETOOTH)
return -EINVAL;
......
......@@ -339,7 +339,8 @@ static int rfcomm_sock_bind(struct socket *sock, struct sockaddr *addr, int addr
struct sock *sk = sock->sk;
int len, err = 0;
if (!addr || addr->sa_family != AF_BLUETOOTH)
if (!addr || addr_len < offsetofend(struct sockaddr, sa_family) ||
addr->sa_family != AF_BLUETOOTH)
return -EINVAL;
memset(&sa, 0, sizeof(sa));
......
......@@ -524,10 +524,8 @@ static int sco_sock_bind(struct socket *sock, struct sockaddr *addr,
BT_DBG("sk %p %pMR", sk, &sa->sco_bdaddr);
if (!addr || addr->sa_family != AF_BLUETOOTH)
return -EINVAL;
if (addr_len < sizeof(struct sockaddr_sco))
if (!addr || addr_len < sizeof(struct sockaddr_sco) ||
addr->sa_family != AF_BLUETOOTH)
return -EINVAL;
lock_sock(sk);
......
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