linux-kernel - [PATCH] Bluetooth: fix oob in sco_sock

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Message-ID: <tencent_D423A78448F764177A26CAB3716365096705@qq.com>
Date: Tue,  9 Apr 2024 21:49:12 +0800
From: Edward Adam Davis <eadavis@...com>
To: syzbot+b71011ec0a23f4d15625@...kaller.appspotmail.com
Cc: johan.hedberg@...il.com,
	linux-bluetooth@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	luiz.dentz@...il.com,
	marcel@...tmann.org,
	netdev@...r.kernel.org,
	syzkaller-bugs@...glegroups.com
Subject: [PATCH] Bluetooth: fix oob in sco_sock_setsockopt

If optlen < sizeof(u32) it will trigger oob, so take the min of them.

Reported-by: syzbot+b71011ec0a23f4d15625@...kaller.appspotmail.com
Signed-off-by: Edward Adam Davis <eadavis@...com>
---
 net/bluetooth/sco.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/bluetooth/sco.c b/net/bluetooth/sco.c
index 43daf965a01e..815646d9e72b 100644
--- a/net/bluetooth/sco.c
+++ b/net/bluetooth/sco.c
@@ -890,7 +890,7 @@ static int sco_sock_setsockopt(struct socket *sock, int level, int optname,
 		break;
 
 	case BT_PKT_STATUS:
-		if (copy_from_sockptr(&opt, optval, sizeof(u32))) {
+		if (copy_from_sockptr(&opt, optval, min_t(int, sizeof(u32), optlen))) {
 			err = -EFAULT;
 			break;
 		}
-- 
2.43.0