linux-kernel - [PATCH] media: atomisp: fix NULL pointer dereference

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Date:   Thu, 16 Jul 2020 13:51:22 +0200
From:   Jiri Slaby <jslaby@...e.cz>
To:     mchehab+huawei@...nel.org
Cc:     linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
        Jiri Slaby <jslaby@...e.cz>
Subject: [PATCH] media: atomisp: fix NULL pointer dereference

I am currently seeing:
BUG: kernel NULL pointer dereference, address: 0000000000000002
...
Hardware name: UMAX VisionBook 10Wi Pro/CQM1018CWP, BIOS CQ1018.007 09/22/2016
RIP: 0010:gmin_subdev_add.cold+0x303/0x312 [atomisp_gmin_platform]
...
Call Trace:
 gmin_camera_platform_data+0x2f/0x60 [atomisp_gmin_platform]
 ov2680_probe+0x7f/0x2b0 [atomisp_ov2680]
 i2c_device_probe+0x95/0x290

power can be NULL and that is properly handled earlier in this function.
Even i2c address is set there. So this is a duplicated assignment which
can cause the bug above. Remove it.

Signed-off-by: Jiri Slaby <jslaby@...e.cz>
Cc: Mauro Carvalho Chehab <mchehab+huawei@...nel.org>
---
 drivers/staging/media/atomisp/pci/atomisp_gmin_platform.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/drivers/staging/media/atomisp/pci/atomisp_gmin_platform.c b/drivers/staging/media/atomisp/pci/atomisp_gmin_platform.c
index 1af9da8acf4c..246742f44d84 100644
--- a/drivers/staging/media/atomisp/pci/atomisp_gmin_platform.c
+++ b/drivers/staging/media/atomisp/pci/atomisp_gmin_platform.c
@@ -574,7 +574,6 @@ static struct gmin_subdev *gmin_subdev_add(struct v4l2_subdev *subdev)
 		gmin_subdevs[i].eldo2_ctrl_shift = gmin_get_var_int(dev, false,
 								    "eldo2_ctrl_shift",
 								    ELDO2_CTRL_SHIFT);
-		gmin_subdevs[i].pwm_i2c_addr = power->addr;
 		break;

 	default:
-- 
2.27.0