From: Martin Wilck Date: Thu, 20 Jul 2017 16:34:02 +0000 (+0200) Subject: nvme: strip trailing 0-bytes in wwid_show X-Git-Tag: v4.13~117^2^2~5 X-Git-Url: https://git.proxmox.com/?a=commitdiff_plain;h=758f3735580c21b8a36d644128af6608120a1dde;p=mirror_ubuntu-artful-kernel.git nvme: strip trailing 0-bytes in wwid_show Some broken controllers (such as earlier Linux targets) pad model or serial fields with 0-bytes rather than spaces. The NVMe spec disallows 0 bytes in "ASCII" fields. Thus strip trailing 0-bytes, too. Also make sure that we get no underflow for pathological input. Signed-off-by: Martin Wilck Reviewed-by: Hannes Reinecke Reviewed-by: Keith Busch Signed-off-by: Christoph Hellwig --- diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c index c49f1f8b2e57..1e9290983694 100644 --- a/drivers/nvme/host/core.c +++ b/drivers/nvme/host/core.c @@ -2004,9 +2004,11 @@ static ssize_t wwid_show(struct device *dev, struct device_attribute *attr, if (memchr_inv(ns->eui, 0, sizeof(ns->eui))) return sprintf(buf, "eui.%8phN\n", ns->eui); - while (ctrl->serial[serial_len - 1] == ' ') + while (serial_len > 0 && (ctrl->serial[serial_len - 1] == ' ' || + ctrl->serial[serial_len - 1] == '\0')) serial_len--; - while (ctrl->model[model_len - 1] == ' ') + while (model_len > 0 && (ctrl->model[model_len - 1] == ' ' || + ctrl->model[model_len - 1] == '\0')) model_len--; return sprintf(buf, "nvme.%04x-%*phN-%*phN-%08x\n", ctrl->vid,