From: Rickard Strandqvist <rickard_strandqvist@spectrumdigital.se>
To: Sudip Mukherjee <sudipm.mukherjee@gmail.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Kiran Padwal <kiran.padwal21@gmail.com>,
"devel@driverdev.osuosl.org" <devel@driverdev.osuosl.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH] staging: gdm724x: gdm_tty: Fix for possible null pointer dereference
Date: Wed, 4 Feb 2015 18:46:34 +0100 [thread overview]
Message-ID: <CAKXHbyOjB4SF_6LwqYnfgRj4cb3vTQDJfMeD0-xiAWoGHZPEuw@mail.gmail.com> (raw)
In-Reply-To: <20150202163633.GA30631@sudip-PC>
2015-02-02 17:36 GMT+01:00 Sudip Mukherjee <sudipm.mukherjee@gmail.com>:
> On Thu, Jan 29, 2015 at 07:46:10PM +0100, Rickard Strandqvist wrote:
>> Fix a possible null pointer dereference, there is
>> otherwise a risk of a possible null pointer dereference.
>>
>> This was found using a static code analysis program called cppcheck
>>
>> Signed-off-by: Rickard Strandqvist <rickard_strandqvist@spectrumdigital.se>
>> ---
>> drivers/staging/gdm724x/gdm_tty.c | 2 +-
>> 1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/drivers/staging/gdm724x/gdm_tty.c b/drivers/staging/gdm724x/gdm_tty.c
>> index 001348c..66b356e 100644
>> --- a/drivers/staging/gdm724x/gdm_tty.c
>> +++ b/drivers/staging/gdm724x/gdm_tty.c
>> @@ -145,7 +145,7 @@ static int gdm_tty_recv_complete(void *data,
>> struct gdm *gdm = tty_dev->gdm[index];
>>
>> if (!GDM_TTY_READY(gdm)) {
>> - if (complete == RECV_PACKET_PROCESS_COMPLETE)
>> + if (gdm && complete == RECV_PACKET_PROCESS_COMPLETE)
> GDM_TTY_READY() is already checking for gdm, there is no chance that gdm can be null at this point. so this additional check is not required.
>
> regards
> sudip
>> gdm_tty_recv(gdm, gdm_tty_recv_complete);
>> return TO_HOST_PORT_CLOSE;
>> }
>> --
>> 1.7.10.4
>>
>> --
>> To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
>> the body of a message to majordomo@vger.kernel.org
>> More majordomo info at http://vger.kernel.org/majordomo-info.html
>> Please read the FAQ at http://www.tux.org/lkml/
Hi Sudip
Yes, GDM_TTY_READY checks gdm, but this is a if(! )
Kind regards
Rickard Strandqvist
next prev parent reply other threads:[~2015-02-04 17:46 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-01-29 18:46 [PATCH] staging: gdm724x: gdm_tty: Fix for possible null pointer dereference Rickard Strandqvist
2015-02-02 16:36 ` Sudip Mukherjee
2015-02-04 17:46 ` Rickard Strandqvist [this message]
2015-02-05 12:19 ` Dan Carpenter
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