From: Suren Baghdasaryan <surenb@google.com>
To: Dan Carpenter <dan.carpenter@oracle.com>
Cc: security@kernel.org, Kevin Deus <kdeus@google.com>,
Samuel Ortiz <sameo@linux.intel.com>,
"David S. Miller" <davem@davemloft.net>,
Allen Pais <allen.pais@oracle.com>,
Kees Cook <keescook@chromium.org>,
linux-wireless@vger.kernel.org, netdev@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH 1/1] NFC: Fix possible memory corruption when handling SHDLC I-Frame commands
Date: Tue, 14 Aug 2018 13:26:04 -0700 [thread overview]
Message-ID: <CAJuCfpHSZuabLr6+t_n7UDamJCAP6EPTNEZ6kNqWOhk2mpYADg@mail.gmail.com> (raw)
In-Reply-To: <CAJuCfpF0Y6wc1z-rbn2wdWROgc_FkD2EX5HzDMcZ1oB5Z=dXSw@mail.gmail.com>
On Tue, Aug 14, 2018 at 9:57 AM, Suren Baghdasaryan <surenb@google.com> wrote:
> On Tue, Aug 14, 2018 at 2:54 AM, Dan Carpenter <dan.carpenter@oracle.com> wrote:
>> Thanks. This is great. I'm so glad these are finally getting fixed.
>>
>> Do we need to fix nfc_hci_msg_rx_work() and nfc_hci_recv_from_llc() as
>> well? In nfc_hci_recv_from_llc() we allow pipe to be NFC_HCI_FRAGMENT
>> (0x7f) so that's one element beyond the end of the array and the
>> NFC_HCI_HCP_RESPONSE isn't checked.
>>
>> Also nci_hci_msg_rx_work() and nci_hci_data_received_cb() use
>> NCI_HCP_MSG_GET_PIPE() so those could be off by one.
>
> Good point. From hci.h:
>
> /*
> * According to specification 102 622 chapter 4.4 Pipes,
> * the pipe identifier is 7 bits long.
> */
> #define NFC_HCI_MAX_PIPES 127
>
> And then:
>
> struct nfc_hci_dev {
> ...
> struct nfc_hci_pipe pipes[NFC_HCI_MAX_PIPES];
> ...
> }
>
> I think the correct fix would be to change it to:
>
> struct nfc_hci_pipe pipes[NFC_HCI_MAX_PIPES + 1];
>
> What do you think?
>
Just to be clear, this would fix the problem Dan described in his
reply and it should be implemented in a separate patch. The original
fix is still valid.
>>
>> regards,
>> dan carpenter
>>
next prev parent reply other threads:[~2018-08-14 20:26 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-08-13 22:39 [PATCH 1/1] NFC: Fix possible memory corruption when handling SHDLC I-Frame commands Suren Baghdasaryan
2018-08-14 0:28 ` Kees Cook
2018-08-14 9:21 ` Greg KH
2018-08-14 9:54 ` Dan Carpenter
2018-08-14 16:57 ` Suren Baghdasaryan
2018-08-14 20:26 ` Suren Baghdasaryan [this message]
2018-08-14 20:33 ` Kees Cook
2018-08-14 20:55 ` Suren Baghdasaryan
2018-08-14 21:49 ` Kees Cook
2018-08-14 22:19 ` Suren Baghdasaryan
2018-08-14 22:38 ` Suren Baghdasaryan
2018-08-15 8:29 ` Dan Carpenter
2018-08-15 16:40 ` Suren Baghdasaryan
2018-08-17 12:06 ` Dan Carpenter
2018-08-17 14:47 ` Dan Carpenter
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