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Subject[PATCH] Bluetooth: Add sockaddr length checks before accessing sa_family in bind and connect handlers
Date
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: Mateusz Jurczyk <mjurczyk@google.com>
---
net/bluetooth/l2cap_sock.c | 5 +++--
net/bluetooth/rfcomm/sock.c | 3 ++-
net/bluetooth/sco.c | 6 ++----
3 files changed, 7 insertions(+), 7 deletions(-)

diff --git a/net/bluetooth/l2cap_sock.c b/net/bluetooth/l2cap_sock.c
index 507b80d59dec..67a8642f57ea 100644
--- a/net/bluetooth/l2cap_sock.c
+++ b/net/bluetooth/l2cap_sock.c
@@ -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;

diff --git a/net/bluetooth/rfcomm/sock.c b/net/bluetooth/rfcomm/sock.c
index ac3c650cb234..2025b45a8bf8 100644
--- a/net/bluetooth/rfcomm/sock.c
+++ b/net/bluetooth/rfcomm/sock.c
@@ -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));
diff --git a/net/bluetooth/sco.c b/net/bluetooth/sco.c
index 728e0c8dc8e7..795e920a3281 100644
--- a/net/bluetooth/sco.c
+++ b/net/bluetooth/sco.c
@@ -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);
--
2.13.2.725.g09c95d1e9-goog
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