lkml.org 
[lkml]   [2020]   [Feb]   [12]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: [PATCH] USB: serial: ti_usb_3410_5052: Replace zero-length array with flexible-array member
From
Date


On 2/12/20 01:59, Johan Hovold wrote:
> On Tue, Feb 11, 2020 at 05:24:20PM -0600, Gustavo A. R. Silva wrote:
>> The current codebase makes use of the zero-length array language
>> extension to the C90 standard, but the preferred mechanism to declare
>> variable-length types such as these ones is a flexible array member[1][2],
>> introduced in C99:
>>
>> struct foo {
>> int stuff;
>> struct boo array[];
>> };
>>
>> By making use of the mechanism above, we will get a compiler warning
>> in case the flexible array does not occur last in the structure, which
>> will help us prevent some kind of undefined behavior bugs from being
>> inadvertenly introduced[3] to the codebase from now on.
>>
>> This issue was found with the help of Coccinelle.
>
> Same here, the scripts may need to be updated as you missed a couple of
> instances:
>
> $ git grep '\[0\];' drivers/usb/serial
> ...
> drivers/usb/serial/io_usbvend.h: __u8 Data[0]; // Data starts here
> drivers/usb/serial/io_usbvend.h: __u8 Data[0]; // Download starts here
> ...
>
> Could you replace these as well so that is done in one patch per
> subsystem?
>

Sure thing. I'll do that.

Thanks for the feedback.
--
Gustavo

\
 
 \ /
  Last update: 2020-02-12 20:26    [W:0.075 / U:0.480 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site