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Message-ID: <tencent_3625ABBA9DBB0A33C69E1A1B8A4B7B1BC308@qq.com>
Date: Fri,  5 Apr 2024 18:20:24 +0800
From: Edward Adam Davis <eadavis@...com>
To: syzbot+b71011ec0a23f4d15625@...kaller.appspotmail.com
Cc: linux-kernel@...r.kernel.org,
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [bluetooth?] KASAN: slab-out-of-bounds Read in l2cap_sock_setsockopt

please test oob in rfcomm_sock_setsockopt

#syz test https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git fe46a7dd189e

diff --git a/net/socket.c b/net/socket.c
index e5f3af49a8b6..d5b2ab6c859c 100644
--- a/net/socket.c
+++ b/net/socket.c
@@ -2327,6 +2327,9 @@ int __sys_setsockopt(int fd, int level, int optname, char __user *user_optval,
 	int err, fput_needed;
 	struct socket *sock;
 
+	if (optlen < 4)
+		return -EINVAL;
+
 	sock = sockfd_lookup_light(fd, &err, &fput_needed);
 	if (!sock)
 		return err;


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