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media: ov7740: Check for possible NULL return value in control creation 

Check that creating the control actually succeeded before accessing it.
A failure would lead to NULL pointer reference. Fix this.

Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
This commit is contained in:
Sakari Ailus 2018-04-12 06:14:26 -04:00 committed by Mauro Carvalho Chehab
parent 31b9cb6ecd
commit bad04a55ab
1 changed files with 8 additions and 3 deletions
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11
drivers/media/i2c/ov7740.c
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@ -980,21 +980,26 @@ static int ov7740_init_controls(struct ov7740 *ov7740)
V4L2_CID_HFLIP, 0, 1, 1, 0);
ov7740->vflip = v4l2_ctrl_new_std(ctrl_hdlr, &ov7740_ctrl_ops,
V4L2_CID_VFLIP, 0, 1, 1, 0);
ov7740->gain = v4l2_ctrl_new_std(ctrl_hdlr, &ov7740_ctrl_ops,
V4L2_CID_GAIN, 0, 1023, 1, 500);
if (ov7740->gain)
ov7740->gain->flags |= V4L2_CTRL_FLAG_VOLATILE;
ov7740->auto_gain = v4l2_ctrl_new_std(ctrl_hdlr, &ov7740_ctrl_ops,
V4L2_CID_AUTOGAIN, 0, 1, 1, 1);
ov7740->exposure = v4l2_ctrl_new_std(ctrl_hdlr, &ov7740_ctrl_ops,
V4L2_CID_EXPOSURE, 0, 65535, 1, 500);
if (ov7740->exposure)
ov7740->exposure->flags |= V4L2_CTRL_FLAG_VOLATILE;
ov7740->auto_exposure = v4l2_ctrl_new_std_menu(ctrl_hdlr,
&ov7740_ctrl_ops,
V4L2_CID_EXPOSURE_AUTO,
V4L2_EXPOSURE_MANUAL, 0,
V4L2_EXPOSURE_AUTO);
ov7740->gain->flags |= V4L2_CTRL_FLAG_VOLATILE;
ov7740->exposure->flags |= V4L2_CTRL_FLAG_VOLATILE;
v4l2_ctrl_auto_cluster(3, &ov7740->auto_wb, 0, false);
v4l2_ctrl_auto_cluster(2, &ov7740->auto_gain, 0, true);
v4l2_ctrl_auto_cluster(2, &ov7740->auto_exposure,