Re: [PATCH] Bluetooth: fix oob in sco_sock_setsockopt

[Luiz Augusto von Dentz]

Hi Edward,

On Tue, Apr 9, 2024 at 9:49 AM Edward Adam Davis <eadavis@xxxxxx> wrote:
>
> If optlen < sizeof(u32) it will trigger oob, so take the min of them.
>
> Reported-by: syzbot+b71011ec0a23f4d15625@xxxxxxxxxxxxxxxxxxxxxxxxx
> Signed-off-by: Edward Adam Davis <eadavis@xxxxxx>
> ---
>  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

https://git.kernel.org/pub/scm/linux/kernel/git/bluetooth/bluetooth-next.git/commit/?id=289bfd91fcf22f7864f3817acff5d8ce9fe73307


-- 
Luiz Augusto von Dentz