If no display is connected or the display modes are incompatible with
the scanout hardware we might end up with a registered framebuffer with
no modes. Trying to enable such a framebuffer will blow up with NULL
ptr dereferences in various places, so just don't do it.

Signed-off-by: Lucas Stach <l.st...@pengutronix.de>
---
 drivers/video/fb.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/video/fb.c b/drivers/video/fb.c
index 004df1e604d6..599ac5b75e0a 100644
--- a/drivers/video/fb.c
+++ b/drivers/video/fb.c
@@ -124,6 +124,9 @@ static int fb_enable_set(struct param_d *param, void *priv)
        struct fb_info *info = priv;
        int enable;
 
+       if (!info->mode)
+               return -EINVAL;
+
        enable = info->p_enable;
 
        if (enable)
-- 
2.16.1


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