linux-kernel - Re: [PATCH] Bluetooth: hci_uart: Add a local variable to store the result of h4_recv

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Date:   Sat, 19 Jan 2019 00:19:20 -0800
From:   Myungho Jung <mhjungk@...il.com>
To:     Marcel Holtmann <marcel@...tmann.org>
Cc:     Johan Hedberg <johan.hedberg@...il.com>,
        linux-bluetooth@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Bluetooth: hci_uart: Add a local variable to store the
 result of h4_recv_buf()

On Fri, Jan 18, 2019 at 10:19:41AM +0100, Marcel Holtmann wrote:
> Hi Myungho,
> 
> > In h4_recv(), if h4_recv_buf() returns error and h4_recv() is
> > asynchronously called again before setting rx_skb to NULL, ERR_PTR will
> > be dereferenced in h4_recv_buf(). Check return value in a local variable
> > before writing to rx_skb.
> > 
> > Reported-by: syzbot+017a32f149406df32703@...kaller.appspotmail.com
> > Signed-off-by: Myungho Jung <mhjungk@...il.com>
> > ---
> > drivers/bluetooth/hci_h4.c | 11 +++++++----
> > 1 file changed, 7 insertions(+), 4 deletions(-)
> 
> patch has been applied to bluetooth-next tree.
> 
> Can you actually fix all callers of h4_recv_buf since they all suffer from the same issue.
> 
> Regards
> 
> Marcel
> 

Hi Marcel,

Sure, let me check other callers and fix them if applicable.

Thanks,
Myungho