Re: patch md-linear-fix-a-division-by-zero-bug-for-very-small-arrays.patch added to 2.6.27-stable tree

[NeilBrown]

On Wed, November 12, 2008 9:28 am, Stefan Lippers-Hollmann wrote:
> Hi
>
> On Dienstag, 11. November 2008, gregkh@xxxxxxx wrote:

>>
>> --- a/drivers/md/linear.c
>> +++ b/drivers/md/linear.c
>> @@ -157,6 +157,8 @@ static linear_conf_t *linear_conf(mddev_
>>
>>  	min_spacing = conf->array_sectors / 2;
>>  	sector_div(min_spacing, PAGE_SIZE/sizeof(struct dev_info *));
>> +	if (min_sectors == 0)
>> +		min_sectors = 1;
>>
>>  	/* min_spacing is the minimum spacing that will fit the hash
>>  	 * table in one PAGE.  This may be much smaller than needed.
>
> drivers/md/linear.c: In function 'linear_conf':
> drivers/md/linear.c:160: error: 'min_sectors' undeclared (first use in
> this function)
> drivers/md/linear.c:160: error: (Each undeclared identifier is reported
> only once
> drivers/md/linear.c:160: error: for each function it appears in.)
> make[5]: *** [drivers/md/linear.o] Error 1
> make[4]: *** [drivers/md] Error 2
> make[4]: *** Waiting for unfinished jobs....
>
> This one obviously depends on:
>
> commit 23242fbb470ff4c8c4d41f178832cf1929273d7d
> Author: Andre Noll <maan@xxxxxxxxxxxxxxx>
> Date:   Mon Oct 13 11:55:12 2008 +1100
>
>     md: linear.c: Make two local variables sector-based.
>
> which in turn depends on previous changes.

Yes, but only syntactically, not semantically.

In 2.6.27, it needs to be
   if (min_spacing == 0)
           min_spacing = 1;

The other previous patches don't need to be backported.

Thanks for reporting this.

NeilBrown


>
> Regards
> 	Stefan Lippers-Hollmann
>

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