Re: [PATCH] Fix invalid-free in bcsp_close()

[Marcel Holtmann]

Hi Alexander,

>>> Syzbot reported an invalid-free that I introduced fixing a memleak.
>>> 
>>> bcsp_recv() also frees bcsp->rx_skb but never nullifies its value.
>>> Nullify bcsp->rx_skb every time it is freed.
>>> 
>>> Signed-off-by: Tomas Bortoli <tomasbortoli@xxxxxxxxx>
>>> Reported-by: syzbot+a0d209a4676664613e76@xxxxxxxxxxxxxxxxxxxxxxxxx
>>> ---
>>> drivers/bluetooth/hci_bcsp.c | 3 +++
>>> 1 file changed, 3 insertions(+)
>> 
>> patch has been applied to bluetooth-next tree.
> I believe this bug requires stable tags, as it can potentially provide
> an arbitrary write (via __skb_unlink) and is triggerable locally with
> user privileges.

I do not have a reproducer for it, but if you do, feel free to propose it for -stable inclusion.

Regards

Marcel