From cb6ec182c13fc87a6562d47f18721dbd702adb52 Mon Sep 17 00:00:00 2001
From: Himangi Saraogi
Date: Sat, 21 Jun 2014 21:27:59 +0530
Subject: 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:
//
@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
//
Signed-off-by: Himangi Saraogi
Acked-by: Julia Lawall
Signed-off-by: Tomi Valkeinen
---
drivers/video/fbdev/omap2/displays-new/panel-sony-acx565akm.c | 5 +++++
1 file changed, 5 insertions(+)
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);
--
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