[PATCH] mlx5: initially reading xstats does not cause seg fault

[Kamil Vojanec]

On 8/18/22 14:30, huzaifa.rahman wrote:

> Bugzilla ID: 296
>
> the size of counters array in mlx5_xstats_get() was smaller
> than the memory we are setting for this array in
> mlx5_os_read_dev_counters(). due to which the extra memory is
> corrupted and thus corrupting the seemingly unrelated variables.
> this happens at the first run only because the n function arg
> of mlx5_xstats_get() which is used to init counters array is
> initialized by adding the preceding statistics which in our case
> (i.e first run) is zero. after the initialization in
> mlx5_os_stats_init() the mlx5_stats_n is populated and thus from
> then onward the counters array size is correct
>
> my changes will only affect the flow of the first run when we
> need to initialize stats in mlx5_os_stats_init(). the size of the
> counters array is set according the mlx5_stats_n variable. by doing
> this we will avoid the memset corrupting other variables` memory
>
> Signed-off-by: huzaifa.rahman<huzaifa.rahman at emumba.com>

Tested-by: Kamil Vojanec<vojanec at cesnet.cz>
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