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

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commit 2e07e8348e 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@vger.kernel.org
Fixes: 1da177e4c3 ("Linux-2.6.12-rc2")
Signed-off-by: Hyunwoo Kim <v4bel@theori.io>
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Hyunwoo Kim 2023-12-09 05:55:18 -05:00 • committed by Greg Kroah-Hartman

parent 470896ecbc

commit 37f71e2c9f

1 changed files with 6 additions and 1 deletions

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net/bluetooth/af_bluetooth.c

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