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authorLuiz Augusto von Dentz <luiz.von.dentz@intel.com>2022-07-29 02:50:48 +0300
committerLuiz Augusto von Dentz <luiz.von.dentz@intel.com>2022-08-09 03:04:24 +0300
commit0eee4995f40573f65ed67cea4d20fcf389d353de (patch)
treeccb1821a701654c138e3e8e21cf82b7d178c35fc /net
parent10b9adb556508a299dc283b7c746b811f6918987 (diff)
downloadlinux-0eee4995f40573f65ed67cea4d20fcf389d353de.tar.xz
Bluetooth: ISO: Fix info leak in iso_sock_getsockopt()
The C standard rules for when struct holes are zeroed out are slightly weird. The existing assignments might initialize everything, but GCC is allowed to (and does sometimes) leave the struct holes uninitialized, so instead of using yet another variable and copy the QoS settings just use a pointer to the stored QoS settings. Fixes: ccf74f2390d60 ("Bluetooth: Add BTPROTO_ISO socket type") Reported-by: Dan Carpenter <dan.carpenter@oracle.com> Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
Diffstat (limited to 'net')
-rw-r--r--net/bluetooth/iso.c10
1 files changed, 5 insertions, 5 deletions
diff --git a/net/bluetooth/iso.c b/net/bluetooth/iso.c
index 19d003727b50..dded22cde0d1 100644
--- a/net/bluetooth/iso.c
+++ b/net/bluetooth/iso.c
@@ -1235,7 +1235,7 @@ static int iso_sock_getsockopt(struct socket *sock, int level, int optname,
{
struct sock *sk = sock->sk;
int len, err = 0;
- struct bt_iso_qos qos;
+ struct bt_iso_qos *qos;
u8 base_len;
u8 *base;
@@ -1261,12 +1261,12 @@ static int iso_sock_getsockopt(struct socket *sock, int level, int optname,
case BT_ISO_QOS:
if (sk->sk_state == BT_CONNECTED || sk->sk_state == BT_CONNECT2)
- qos = iso_pi(sk)->conn->hcon->iso_qos;
+ qos = &iso_pi(sk)->conn->hcon->iso_qos;
else
- qos = iso_pi(sk)->qos;
+ qos = &iso_pi(sk)->qos;
- len = min_t(unsigned int, len, sizeof(qos));
- if (copy_to_user(optval, (char *)&qos, len))
+ len = min_t(unsigned int, len, sizeof(*qos));
+ if (copy_to_user(optval, qos, len))
err = -EFAULT;
break;