[PATCH 6.8 078/172] Bluetooth: ISO: Fix not validating setsockopt user input

Greg Kroah-Hartman
2024-04-15T14:27:20Z

From: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>

[ Upstream commit 9e8742cdfc4b0e65266bb4a901a19462bda9285e ]

Check user input length before copying data.

Fixes: ccf74f2390d6 ("Bluetooth: Add BTPROTO_ISO socket type")
Fixes: 0731c5ab4d51 ("Bluetooth: ISO: Add support for BT_PKT_STATUS")
Fixes: f764a6c2c1e4 ("Bluetooth: ISO: Add broadcast support")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
net/bluetooth/iso.c | 36 ++++++++++++------------------------
1 file changed, 12 insertions(+), 24 deletions(-)

diff --git a/net/bluetooth/iso.c b/net/bluetooth/iso.c
index 3681e3673654a..a8b05baa8e5a9 100644
--- a/net/bluetooth/iso.c
+++ b/net/bluetooth/iso.c
@@ -1479,7 +1479,7 @@ static int iso_sock_setsockopt(struct socket *sock, int level, int optname,
sockptr_t optval, unsigned int optlen)
{
struct sock *sk = sock->sk;
- int len, err = 0;
+ int err = 0;
struct bt_iso_qos qos = default_qos;
u32 opt;

@@ -1494,10 +1494,9 @@ static int iso_sock_setsockopt(struct socket *sock, int level, int optname,
break;
}

- if (copy_from_sockptr(&opt, optval, sizeof(u32))) {
- err = -EFAULT;
+ err = bt_copy_from_sockptr(&opt, sizeof(opt), optval, optlen);
+ if (err)
break;
- }

if (opt)
set_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags);
@@ -1506,10 +1505,9 @@ static int iso_sock_setsockopt(struct socket *sock, int level, int optname,
break;

case BT_PKT_STATUS:
- if (copy_from_sockptr(&opt, optval, sizeof(u32))) {
- err = -EFAULT;
+ err = bt_copy_from_sockptr(&opt, sizeof(opt), optval, optlen);
+ if (err)
break;
- }

if (opt)
set_bit(BT_SK_PKT_STATUS, &bt_sk(sk)->flags);
@@ -1524,17 +1522,9 @@ static int iso_sock_setsockopt(struct socket *sock, int level, int optname,
break;
}

- len = min_t(unsigned int, sizeof(qos), optlen);
-
- if (copy_from_sockptr(&qos, optval, len)) {
- err = -EFAULT;
- break;
- }
-
- if (len == sizeof(qos.ucast) && !check_ucast_qos(&qos)) {
- err = -EINVAL;
+ err = bt_copy_from_sockptr(&qos, sizeof(qos), optval, optlen);
+ if (err)
break;
- }

iso_pi(sk)->qos = qos;
iso_pi(sk)->qos_user_set = true;
@@ -1549,18 +1539,16 @@ static int iso_sock_setsockopt(struct socket *sock, int level, int optname,
}

if (optlen > sizeof(iso_pi(sk)->base)) {
- err = -EOVERFLOW;
+ err = -EINVAL;
break;
}

- len = min_t(unsigned int, sizeof(iso_pi(sk)->base), optlen);
-
- if (copy_from_sockptr(iso_pi(sk)->base, optval, len)) {
- err = -EFAULT;
+ err = bt_copy_from_sockptr(iso_pi(sk)->base, optlen, optval,
+ optlen);
+ if (err)
break;
- }

- iso_pi(sk)->base_len = len;
+ iso_pi(sk)->base_len = optlen;

break;

--
2.43.0