net/9p: use memcpy() instead of snprintf() in p9_mount_tag_show()

[firefly-linux-kernel-4.4.55.git] / net / 9p / trans_virtio.c

diff --git a/net/9p/trans_virtio.c b/net/9p/trans_virtio.c
index 36a1a739ad68ff57eace5ba4bc4166faf12c485b..486df019f8752eef6adc1aec7d5a49d656cd3301 100644 (file)
--- a/net/9p/trans_virtio.c
+++ b/net/9p/trans_virtio.c
@@ -504,7 +504,10 @@ static ssize_t p9_mount_tag_show(struct device *dev,
        vdev = dev_to_virtio(dev);
        chan = vdev->priv;
 
-       return snprintf(buf, chan->tag_len + 1, "%s", chan->tag);
+       memcpy(buf, chan->tag, chan->tag_len);
+       buf[chan->tag_len] = 0;
+
+       return chan->tag_len + 1;
 }
 
 static DEVICE_ATTR(mount_tag, 0444, p9_mount_tag_show, NULL);