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Fix potential memory leak in vinput #279

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Oct 26, 2024
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Fix potential memory leak in vinput #279

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2 changes: 2 additions & 0 deletions examples/vinput.c
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Original file line number Diff line number Diff line change
Expand Up @@ -283,10 +283,12 @@ static ssize_t export_store(struct class *class, struct class_attribute *attr,
return len;

fail_register_vinput:
input_free_device(vinput->input);
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If we call input_allocate_device in vinput_alloc_vdevice , why do we handle it manually instead of putting input_free_device in the corresponding release function?

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I believe input_free_device should be decoupled from the release function vinput_destroy_vdevice. In both unexport_store and vinput_unregister, the vinput_unregister_vdevice function is called before device_unregister, with each invoking input_unregister_device followed by vinput_destroy_vdevice. Embedding input_free_device within vinput_destroy_vdevice could contradict the documented comments in the source code [1].

[1] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/drivers/input/input.c#n2386

device_unregister(&vinput->dev);
/* avoid calling vinput_destroy_vdevice() twice */
return err;
fail_register:
input_free_device(vinput->input);
vinput_destroy_vdevice(vinput);
fail:
return err;
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