Patch "Bluetooth: af_bluetooth: Fix Use-After-Free in bt_sock_recvmsg" has been added to the 6.6-stable tree

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This is a note to let you know that I've just added the patch titled

    Bluetooth: af_bluetooth: Fix Use-After-Free in bt_sock_recvmsg

to the 6.6-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     bluetooth-af_bluetooth-fix-use-after-free-in-bt_sock_recvmsg.patch
and it can be found in the queue-6.6 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.


>From 2e07e8348ea454615e268222ae3fc240421be768 Mon Sep 17 00:00:00 2001
From: Hyunwoo Kim <v4bel@xxxxxxxxx>
Date: Sat, 9 Dec 2023 05:55:18 -0500
Subject: Bluetooth: af_bluetooth: Fix Use-After-Free in bt_sock_recvmsg

From: Hyunwoo Kim <v4bel@xxxxxxxxx>

commit 2e07e8348ea454615e268222ae3fc240421be768 upstream.

This can cause a race with bt_sock_ioctl() because
bt_sock_recvmsg() gets the skb from sk->sk_receive_queue
and then frees it without holding lock_sock.
A use-after-free for a skb occurs with the following flow.
```
bt_sock_recvmsg() -> skb_recv_datagram() -> skb_free_datagram()
bt_sock_ioctl() -> skb_peek()
```
Add lock_sock to bt_sock_recvmsg() to fix this issue.

Cc: stable@xxxxxxxxxxxxxxx
Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Signed-off-by: Hyunwoo Kim <v4bel@xxxxxxxxx>
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 net/bluetooth/af_bluetooth.c |    7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

--- a/net/bluetooth/af_bluetooth.c
+++ b/net/bluetooth/af_bluetooth.c
@@ -309,11 +309,14 @@ int bt_sock_recvmsg(struct socket *sock,
 	if (flags & MSG_OOB)
 		return -EOPNOTSUPP;
 
+	lock_sock(sk);
+
 	skb = skb_recv_datagram(sk, flags, &err);
 	if (!skb) {
 		if (sk->sk_shutdown & RCV_SHUTDOWN)
-			return 0;
+			err = 0;
 
+		release_sock(sk);
 		return err;
 	}
 
@@ -343,6 +346,8 @@ int bt_sock_recvmsg(struct socket *sock,
 
 	skb_free_datagram(sk, skb);
 
+	release_sock(sk);
+
 	if (flags & MSG_TRUNC)
 		copied = skblen;
 


Patches currently in stable-queue which might be from v4bel@xxxxxxxxx are

queue-6.6/bluetooth-af_bluetooth-fix-use-after-free-in-bt_sock_recvmsg.patch




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