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* re: media: i2c: add OV02A10 image sensor driver
@ 2020-12-03 18:00 Colin Ian King
  2020-12-03 18:10 ` Andy Shevchenko
  0 siblings, 1 reply; 7+ messages in thread
From: Colin Ian King @ 2020-12-03 18:00 UTC (permalink / raw)
  To: Dongchun Zhu
  Cc: Andy Shevchenko, Sakari Ailus, Mauro Carvalho Chehab,
	Matthias Brugger, linux-media, linux-arm-kernel, linux-mediatek,
	linux-kernel

Hi,

Static analysis on linux-next with Coverity has detected an issue with
the following commit:

529 static int ov02a10_s_stream(struct v4l2_subdev *sd, int on)
530 {
531        struct ov02a10 *ov02a10 = to_ov02a10(sd);
532        struct i2c_client *client =
v4l2_get_subdevdata(&ov02a10->subdev);

   1. var_decl: Declaring variable ret without initializer.

533        int ret;
534
535        mutex_lock(&ov02a10->mutex);
536

   2. Condition ov02a10->streaming == on, taking true branch.

537        if (ov02a10->streaming == on)

   3. Jumping to label unlock_and_return.

538                goto unlock_and_return;
539
540        if (on) {
541                ret = pm_runtime_get_sync(&client->dev);
542                if (ret < 0) {
543                        pm_runtime_put_noidle(&client->dev);
544                        goto unlock_and_return;
545                }
546
547                ret = __ov02a10_start_stream(ov02a10);
548                if (ret) {
549                        __ov02a10_stop_stream(ov02a10);
550                        ov02a10->streaming = !on;
551                        goto err_rpm_put;
552                }
553        } else {
554                __ov02a10_stop_stream(ov02a10);
555                pm_runtime_put(&client->dev);
556        }
557
558        ov02a10->streaming = on;
559        mutex_unlock(&ov02a10->mutex);
560
561        return 0;
562
563 err_rpm_put:
564        pm_runtime_put(&client->dev);
565 unlock_and_return:
566        mutex_unlock(&ov02a10->mutex);
567

Uninitialized scalar variable (UNINIT)
    4. uninit_use: Using uninitialized value ret.

568        return ret;
569 }

Variable ret has not been initialized, so the error return value is a
garbage value. It should be initialized with some appropriate negative
error code, or ret could be removed and the return should return a
literal value of a error code.

I was unsure what value is appropriate to fix this, so instead I'm
reporting this issue.

Colin

^ permalink raw reply	[flat|nested] 7+ messages in thread

end of thread, other threads:[~2020-12-04 11:47 UTC | newest]

Thread overview: 7+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2020-12-03 18:00 media: i2c: add OV02A10 image sensor driver Colin Ian King
2020-12-03 18:10 ` Andy Shevchenko
2020-12-03 18:24   ` Colin Ian King
2020-12-03 18:30     ` Andy Shevchenko
2020-12-04 11:45       ` Sakari Ailus
2020-12-04  2:46   ` Dongchun Zhu
2020-12-04  6:23     ` Tomasz Figa

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