Rasmus,
I do not see a need for your first patch proposal. Our code works fine
in our environment.
But I will pickup your second part to remove the explicit setting of the
0-termination. Thanks!
Regards, Ursula
On Sat, 2015-12-05 at 22:32 +0100, Rasmus Villemoes wrote:
> AFAICT, char is unsigned on s390. Relying on that is a little
> subtle. The problem here is that if char happens to be signed and
> e.g. card->info.mcl_level[2] contains the value -16, the formatted
> output will be "fffffff0", thus overflowing card->info.mcl_level
> (which has size 5). To help future readers, simply do an explicit mask
> so that the value passed to sprintf is in 0-255. If char is indeed
> unsigned, gcc should be able to elide the masking.
>
> In any case, the subsequent 0-termination is redundant, since sprintf
> has done that.
>
> Signed-off-by: Rasmus Villemoes <linux@xxxxxxxxxxxxxxxxxx>
> ---
> drivers/s390/net/qeth_core_main.c | 6 ++----
> 1 file changed, 2 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/s390/net/qeth_core_main.c b/drivers/s390/net/qeth_core_main.c
> index 31ac53fa5cee..84bc4b862fbb 100644
> --- a/drivers/s390/net/qeth_core_main.c
> +++ b/drivers/s390/net/qeth_core_main.c
> @@ -2682,10 +2682,8 @@ void qeth_print_status_message(struct qeth_card *card)
> * */
> if (!card->info.mcl_level[0]) {
> sprintf(card->info.mcl_level, "%02x%02x",
> - card->info.mcl_level[2],
> - card->info.mcl_level[3]);
> -
> - card->info.mcl_level[QETH_MCL_LENGTH] = 0;
> + card->info.mcl_level[2] & 0xff,
> + card->info.mcl_level[3] & 0xff);
> break;
> }
> /* fallthrough */
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