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mailbox: zynq-ipi: fix error handling while device_register() fails

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If device_register() fails, it has two issues:
1. The name allocated by dev_set_name() is leaked.
2. The parent of device is not NULL, device_unregister() is called
   in zynqmp_ipi_free_mboxes(), it will lead a kernel crash because
   of removing not added device.

Call put_device() to give up the reference, so the name is freed in
kobject_cleanup(). Add device registered check in zynqmp_ipi_free_mboxes()
to avoid null-ptr-deref.

Fixes: 4981b82ba2ff ("mailbox: ZynqMP IPI mailbox controller")
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
This commit is contained in:
Yang Yingliang 2022-11-10 23:08:22 +08:00 committed by Jassi Brar
parent acabe12c61
commit a6792a0cde
1 changed files with 3 additions and 1 deletions
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4
drivers/mailbox/zynqmp-ipi-mailbox.c
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@ -493,6 +493,7 @@ static int zynqmp_ipi_mbox_probe(struct zynqmp_ipi_mbox *ipi_mbox,
ret = device_register(&ipi_mbox->dev);
if (ret) {
dev_err(dev, "Failed to register ipi mbox dev.\n");
put_device(&ipi_mbox->dev);
return ret;
}
mdev = &ipi_mbox->dev;
@ -619,7 +620,8 @@ static void zynqmp_ipi_free_mboxes(struct zynqmp_ipi_pdata *pdata)
ipi_mbox = &pdata->ipi_mboxes[i];
if (ipi_mbox->dev.parent) {
mbox_controller_unregister(&ipi_mbox->mbox);
device_unregister(&ipi_mbox->dev);
if (device_is_registered(&ipi_mbox->dev))
device_unregister(&ipi_mbox->dev);
}
}
}