drivers/video/fbdev : dereference without an error test

After a variable is assigned the result of backlight_device_register, an
error test should be performed before a dereference.

A simplified version of the semantic match that finds this problem is
as follows:

// <smpl>
@def0@
expression x;
position p0;
@@

x@p0 = backlight_device_register(...)

@protected@
expression def0.x,E;
position def0.p0;
position p;
statement S;
@@
x@p0
... when != x = E
if (!IS_ERR(x) && ...) {<... x@p ...>} else S

@unprotected@
expression def0.x,E;
identifier fld;
position def0.p0;
position p != protected.p;
@@
x@p0
... when != x = E
* x@p->fld
// </smpl>

Signed-off-by: Himangi Saraogi <himangi774@gmail.com>
Acked-by: Julia Lawall <julia.lawall@lip6.fr>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>

1 files changed, 5 insertions, 0 deletions

diff --git a/drivers/video/fbdev/omap2/displays-new/panel-sony-acx565akm.c b/drivers/video/fbdev/omap2/displays-new/panel-sony-acx565akm.c
index c7ba4d8b928a..617f8d2f5127 100644
--- a/drivers/video/fbdev/omap2/displays-new/panel-sony-acx565akm.c
+++ b/drivers/video/fbdev/omap2/displays-new/panel-sony-acx565akm.c
@@ -817,6 +817,10 @@ static int acx565akm_probe(struct spi_device *spi)
 
         bldev = backlight_device_register("acx565akm", &ddata->spi->dev,
                         ddata, &acx565akm_bl_ops, &props);
+        if (IS_ERR(bldev)) {
+                r = PTR_ERR(bldev);
+                goto err_reg_bl;
+        }
         ddata->bl_dev = bldev;
         if (ddata->has_cabc) {
                 r = sysfs_create_group(&bldev->dev.kobj, &bldev_attr_group);
@@ -862,6 +866,7 @@ err_reg:
         sysfs_remove_group(&bldev->dev.kobj, &bldev_attr_group);
 err_sysfs:
         backlight_device_unregister(bldev);
+err_reg_bl:
 err_detect:
 err_gpio:
         omap_dss_put_device(ddata->in);