linux-kernel - Re: Input: cyttsp4 - SPI driver for Cypress TMA4XX touchscreen devices

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Date:	Tue, 9 Jul 2013 10:12:00 +0300
From:	Ferruh Yigit <fery@...ress.com>
To:	Geert Uytterhoeven <geert@...ux-m68k.org>
CC:	Javier Martinez Canillas <javier@...hile0.org>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	"linux-input@...r.kernel.org" <linux-input@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: Input: cyttsp4 - SPI driver for Cypress TMA4XX touchscreen devices

On 07/07/2013 10:15 PM, Geert Uytterhoeven wrote:
> On Fri, Jul 5, 2013 at 1:51 AM, Linux Kernel Mailing List
> <linux-kernel@...r.kernel.org> wrote:
>> +++ b/drivers/input/touchscreen/cyttsp4_spi.c
>
>> +static int cyttsp_spi_xfer(struct device *dev, u8 *xfer_buf,
>> +                          u8 op, u8 reg, u8 *buf, int length)
>> +{
>
>> +       if (reg > 255)
>
> As "reg" is "u8", this is never true:
>
> drivers/input/touchscreen/cyttsp4_spi.c: In function ‘cyttsp_spi_xfer’:
> drivers/input/touchscreen/cyttsp4_spi.c:66: warning: comparison is
> always false due to limited range of data type
>
>> +               wr_buf[0] = op + CY_SPI_A8_BIT;
>> +       else
>> +               wr_buf[0] = op;
>
> Can the if-clause and the first branch just be removed, or is there a real bug
> involved (e.g. wrong type for "reg")?

Yes there was a bug here, and already sent a patch for this, please
check https://patchwork.kernel.org/patch/2820561/

thanks,
ferruh


This message and any attachments may contain Cypress (or its subsidiaries) confidential information. If it has been received in error, please advise the sender and immediately delete this message.
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/