[PATCH 1/1] drm/gma500: mdfld: avoid possible null pointer dereference

[Heinrich Schuchardt]

Only dereference sender after checking if sender is NULL.

Signed-off-by: Heinrich Schuchardt <xypron.g...@gmx.de>
---
 drivers/gpu/drm/gma500/mdfld_dsi_pkg_sender.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/gma500/mdfld_dsi_pkg_sender.c 
b/drivers/gpu/drm/gma500/mdfld_dsi_pkg_sender.c
index 1616af2..c50534c 100644
--- a/drivers/gpu/drm/gma500/mdfld_dsi_pkg_sender.c
+++ b/drivers/gpu/drm/gma500/mdfld_dsi_pkg_sender.c
@@ -520,7 +520,7 @@ static int __read_panel_data(struct mdfld_dsi_pkg_sender 
*sender, u8 data_type,
                        u8 *data, u16 len, u32 *data_out, u16 len_out, bool hs)
 {
        unsigned long flags;
-       struct drm_device *dev = sender->dev;
+       struct drm_device *dev;
        int i;
        u32 gen_data_reg;
        int retry = MDFLD_DSI_READ_MAX_COUNT;
@@ -530,6 +530,8 @@ static int __read_panel_data(struct mdfld_dsi_pkg_sender 
*sender, u8 data_type,
                return -EINVAL;
        }
 
+       dev = sender->dev;
+
        /**
         * do reading.
         * 0) send out generic read request
-- 
2.1.4