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Commit 280d66b3 authored by Dongliang Mu's avatar Dongliang Mu Committed by Sasha Levin
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ipack: tpci200: fix many double free issues in tpci200_pci_probe 



[ Upstream commit 57a1681095f912239c7fb4d66683ab0425973838 ]

The function tpci200_register called by tpci200_install and
tpci200_unregister called by tpci200_uninstall are in pair. However,
tpci200_unregister has some cleanup operations not in the
tpci200_register. So the error handling code of tpci200_pci_probe has
many different double free issues.

Fix this problem by moving those cleanup operations out of
tpci200_unregister, into tpci200_pci_remove and reverting
the previous commit 9272e5d0028d ("ipack/carriers/tpci200:
Fix a double free in tpci200_pci_probe").

Fixes: 9272e5d0028d ("ipack/carriers/tpci200: Fix a double free in tpci200_pci_probe")
Cc: stable@vger.kernel.org
Reported-by: default avatarDongliang Mu <mudongliangabcd@gmail.com>
Signed-off-by: default avatarDongliang Mu <mudongliangabcd@gmail.com>
Link: https://lore.kernel.org/r/20210810100323.3938492-1-mudongliangabcd@gmail.com


Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: default avatarSasha Levin <sashal@kernel.org>
parent cb7aa510

drivers/ipack/carriers/tpci200.c

+18 −18
Original line number Diff line number Diff line
@@ -91,16 +91,13 @@ static void tpci200_unregister(struct tpci200_board *tpci200) 
	free_irq(tpci200->info->pdev->irq, (void *) tpci200);



	pci_iounmap(tpci200->info->pdev, tpci200->info->interface_regs);

	pci_iounmap(tpci200->info->pdev, tpci200->info->cfg_regs);



	pci_release_region(tpci200->info->pdev, TPCI200_IP_INTERFACE_BAR);

	pci_release_region(tpci200->info->pdev, TPCI200_IO_ID_INT_SPACES_BAR);

	pci_release_region(tpci200->info->pdev, TPCI200_MEM16_SPACE_BAR);

	pci_release_region(tpci200->info->pdev, TPCI200_MEM8_SPACE_BAR);

	pci_release_region(tpci200->info->pdev, TPCI200_CFG_MEM_BAR);



	pci_disable_device(tpci200->info->pdev);

	pci_dev_put(tpci200->info->pdev);

}



static void tpci200_enable_irq(struct tpci200_board *tpci200,
@@ -529,7 +526,7 @@ static int tpci200_pci_probe(struct pci_dev *pdev, 
	tpci200->info = kzalloc(sizeof(struct tpci200_infos), GFP_KERNEL);

	if (!tpci200->info) {

		ret = -ENOMEM;

		goto out_err_info;

		goto err_tpci200;

	}



	pci_dev_get(pdev);
@@ -540,7 +537,7 @@ static int tpci200_pci_probe(struct pci_dev *pdev, 
	if (ret) {

		dev_err(&pdev->dev, "Failed to allocate PCI Configuration Memory");

		ret = -EBUSY;

		goto out_err_pci_request;

		goto err_tpci200_info;

	}

	tpci200->info->cfg_regs = ioremap_nocache(

			pci_resource_start(pdev, TPCI200_CFG_MEM_BAR),
@@ -548,7 +545,7 @@ static int tpci200_pci_probe(struct pci_dev *pdev, 
	if (!tpci200->info->cfg_regs) {

		dev_err(&pdev->dev, "Failed to map PCI Configuration Memory");

		ret = -EFAULT;

		goto out_err_ioremap;

		goto err_request_region;

	}



	/* Disable byte swapping for 16 bit IP module access. This will ensure
@@ -571,7 +568,7 @@ static int tpci200_pci_probe(struct pci_dev *pdev, 
	if (ret) {

		dev_err(&pdev->dev, "error during tpci200 install\n");

		ret = -ENODEV;

		goto out_err_install;

		goto err_cfg_regs;

	}



	/* Register the carrier in the industry pack bus driver */
@@ -583,7 +580,7 @@ static int tpci200_pci_probe(struct pci_dev *pdev, 
		dev_err(&pdev->dev,

			"error registering the carrier on ipack driver\n");

		ret = -EFAULT;

		goto out_err_bus_register;

		goto err_tpci200_install;

	}



	/* save the bus number given by ipack to logging purpose */
@@ -594,19 +591,16 @@ static int tpci200_pci_probe(struct pci_dev *pdev, 
		tpci200_create_device(tpci200, i);

	return 0;



out_err_bus_register:

err_tpci200_install:

	tpci200_uninstall(tpci200);

	/* tpci200->info->cfg_regs is unmapped in tpci200_uninstall */

	tpci200->info->cfg_regs = NULL;

out_err_install:

	if (tpci200->info->cfg_regs)

		iounmap(tpci200->info->cfg_regs);

out_err_ioremap:

err_cfg_regs:

	pci_iounmap(tpci200->info->pdev, tpci200->info->cfg_regs);

err_request_region:

	pci_release_region(pdev, TPCI200_CFG_MEM_BAR);

out_err_pci_request:

	pci_dev_put(pdev);

err_tpci200_info:

	kfree(tpci200->info);

out_err_info:

	pci_dev_put(pdev);

err_tpci200:

	kfree(tpci200);

	return ret;

}
@@ -616,6 +610,12 @@ static void __tpci200_pci_remove(struct tpci200_board *tpci200) 
	ipack_bus_unregister(tpci200->info->ipack_bus);

	tpci200_uninstall(tpci200);



	pci_iounmap(tpci200->info->pdev, tpci200->info->cfg_regs);



	pci_release_region(tpci200->info->pdev, TPCI200_CFG_MEM_BAR);



	pci_dev_put(tpci200->info->pdev);



	kfree(tpci200->info);

	kfree(tpci200);

}