Re: [PATCH 6.12.y] Bluetooth: L2CAP: Fix null-ptr-deref in l2cap_sock_get_sndtimeo_cb()

[Greg KH <gregkh@linuxfoundation.org>]

On Wed, May 13, 2026 at 09:02:37AM -0400, Siwei Zhang wrote:
> Add the same NULL guard already present in
> l2cap_sock_resume_cb() and l2cap_sock_ready_cb().
> 
> Fixes: 8d836d71e222 ("Bluetooth: Access sk_sndtimeo indirectly in l2cap_core.c")
> Cc: stable@kernel.org
> Signed-off-by: Siwei Zhang <oss@fourdim.xyz>
> Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
> ---
>  net/bluetooth/l2cap_sock.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/net/bluetooth/l2cap_sock.c b/net/bluetooth/l2cap_sock.c
> index 1960d35b3be0..adee617517bb 100644
> --- a/net/bluetooth/l2cap_sock.c
> +++ b/net/bluetooth/l2cap_sock.c
> @@ -1725,6 +1725,9 @@ static long l2cap_sock_get_sndtimeo_cb(struct l2cap_chan *chan)
>  {
>  	struct sock *sk = chan->data;
>  
> +	if (!sk)
> +		return 0;
> +
>  	return sk->sk_sndtimeo;
>  }
>  
> -- 
> 2.54.0
> 
> 

<formletter>

This is not the correct way to submit patches for inclusion in the
stable kernel tree.  Please read:
    https://www.kernel.org/doc/html/latest/process/stable-kernel-rules.html
for how to do this properly.

</formletter>