greybus: light: fix incorrect led attribute files allocation

Fix incorrect attribute size when the channel supports fader, as well as
fixing the issue that the attribute list is not null terminated.

Testing Done:
 - Verified by setting brightness and color on red/green/blue leds
   of the device class test board.

Signed-off-by: David Lin <dtwlin@google.com>
Reviewed-by: Rui Miguel Silva <rui.silva@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>

diff --git a/drivers/staging/greybus/light.c b/drivers/staging/greybus/light.c
index a57d59339bd6f12febed76152c29e5b40ac4385d..85bf5559f6fb89cdda97a7ac54ee129c02f99d0a 100644 (file)
--- a/drivers/staging/greybus/light.c
+++ b/drivers/staging/greybus/light.c
@@ -293,13 +293,14 @@ static int channel_attr_groups_set(struct gb_channel *channel,
        if (channel->flags & GB_LIGHT_CHANNEL_MULTICOLOR)
                size++;
        if (channel->flags & GB_LIGHT_CHANNEL_FADER)
-               size++;
+               size += 2;
 
        if (!size)
                return 0;
 
        /* Set attributes based in the channel flags */
-       channel->attrs = kcalloc(size, sizeof(**channel->attrs), GFP_KERNEL);
+       channel->attrs = kcalloc(size + 1, sizeof(**channel->attrs),
+                                GFP_KERNEL);
        if (!channel->attrs)
                return -ENOMEM;
        channel->attr_group = kcalloc(1, sizeof(*channel->attr_group),