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From: Dongliang Mu <mudongliangabcd@gmail.com>
To: Samuel Iglesias Gonsalvez <siglesias@igalia.com>,
	Jens Taprogge <jens.taprogge@taprogge.org>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Dongliang Mu <mudongliangabcd@gmail.com>,
	Aditya Srivastava <yashsri421@gmail.com>,
	Lv Yunlong <lyl2019@mail.ustc.edu.cn>,
	Zhouyang Jia <jiazhouyang09@gmail.com>
Cc: Randy Dunlap <rdunlap@infradead.org>,
	industrypack-devel@lists.sourceforge.net,
	linux-kernel@vger.kernel.org
Subject: [PATCH 3/3] ipack: tpci200: fix memory leak in the tpci200_register
Date: Wed, 21 Jul 2021 19:11:32 +0800	[thread overview]
Message-ID: <20210721111137.1523229-3-mudongliangabcd@gmail.com> (raw)
In-Reply-To: <20210721111137.1523229-1-mudongliangabcd@gmail.com>

The error handling code in tpci200_register does not free interface_regs
allocated by ioremap and the current version of error handling code is
problematic.

Fix this by refactoring the error handling code and free interface_regs
when necessary.

Reported-by: Dongliang Mu <mudongliangabcd@gmail.com>
Fixes: 43986798fd50 ("ipack: add error handling for ioremap_nocache")
Signed-off-by: Dongliang Mu <mudongliangabcd@gmail.com>
---
 drivers/ipack/carriers/tpci200.c | 52 +++++++++++++++++---------------
 1 file changed, 28 insertions(+), 24 deletions(-)

diff --git a/drivers/ipack/carriers/tpci200.c b/drivers/ipack/carriers/tpci200.c
index 7fbfb17c341b..a4e5883321df 100644
--- a/drivers/ipack/carriers/tpci200.c
+++ b/drivers/ipack/carriers/tpci200.c
@@ -84,20 +84,6 @@ static void tpci200_set_mask(struct tpci200_board *tpci200,
 	spin_unlock_irqrestore(&tpci200->regs_lock, flags);
 }
 
-static void tpci200_unregister(struct tpci200_board *tpci200)
-{
-	free_irq(tpci200->info->pdev->irq, (void *) tpci200);
-
-	iounmap(tpci200->info->interface_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_disable_device(tpci200->info->pdev);
-}
-
 static void tpci200_enable_irq(struct tpci200_board *tpci200,
 			       int islot)
 {
@@ -254,7 +240,7 @@ static int tpci200_register(struct tpci200_board *tpci200)
 			"(bn 0x%X, sn 0x%X) failed to allocate PCI resource for BAR 2 !",
 			tpci200->info->pdev->bus->number,
 			tpci200->info->pdev->devfn);
-		goto out_disable_pci;
+		goto err_enable_device;
 	}
 
 	/* Request IO ID INT space (Bar 3) */
@@ -266,7 +252,7 @@ static int tpci200_register(struct tpci200_board *tpci200)
 			"(bn 0x%X, sn 0x%X) failed to allocate PCI resource for BAR 3 !",
 			tpci200->info->pdev->bus->number,
 			tpci200->info->pdev->devfn);
-		goto out_release_ip_space;
+		goto err_ip_interface_bar;
 	}
 
 	/* Request MEM8 space (Bar 5) */
@@ -277,7 +263,7 @@ static int tpci200_register(struct tpci200_board *tpci200)
 			"(bn 0x%X, sn 0x%X) failed to allocate PCI resource for BAR 5!",
 			tpci200->info->pdev->bus->number,
 			tpci200->info->pdev->devfn);
-		goto out_release_ioid_int_space;
+		goto err_io_id_int_spaces_bar;
 	}
 
 	/* Request MEM16 space (Bar 4) */
@@ -288,7 +274,7 @@ static int tpci200_register(struct tpci200_board *tpci200)
 			"(bn 0x%X, sn 0x%X) failed to allocate PCI resource for BAR 4!",
 			tpci200->info->pdev->bus->number,
 			tpci200->info->pdev->devfn);
-		goto out_release_mem8_space;
+		goto err_mem8_space_bar;
 	}
 
 	/* Map internal tpci200 driver user space */
@@ -302,7 +288,7 @@ static int tpci200_register(struct tpci200_board *tpci200)
 			tpci200->info->pdev->bus->number,
 			tpci200->info->pdev->devfn);
 		res = -ENOMEM;
-		goto out_release_mem8_space;
+		goto err_mem16_space_bar;
 	}
 
 	/* Initialize lock that protects interface_regs */
@@ -341,22 +327,40 @@ static int tpci200_register(struct tpci200_board *tpci200)
 			"(bn 0x%X, sn 0x%X) unable to register IRQ !",
 			tpci200->info->pdev->bus->number,
 			tpci200->info->pdev->devfn);
-		goto out_release_ioid_int_space;
+		goto err_interface_regs;
 	}
 
 	return 0;
 
-out_release_mem8_space:
+err_interface_regs:
+	iounmap(tpci200->info->interface_regs);
+err_mem16_space_bar:
+	pci_release_region(tpci200->info->pdev, TPCI200_MEM16_SPACE_BAR);
+err_mem8_space_bar:
 	pci_release_region(tpci200->info->pdev, TPCI200_MEM8_SPACE_BAR);
-out_release_ioid_int_space:
+err_io_id_int_spaces_bar:
 	pci_release_region(tpci200->info->pdev, TPCI200_IO_ID_INT_SPACES_BAR);
-out_release_ip_space:
+err_ip_interface_bar:
 	pci_release_region(tpci200->info->pdev, TPCI200_IP_INTERFACE_BAR);
-out_disable_pci:
+err_enable_device:
 	pci_disable_device(tpci200->info->pdev);
 	return res;
 }
 
+static void tpci200_unregister(struct tpci200_board *tpci200)
+{
+	free_irq(tpci200->info->pdev->irq, (void *) tpci200);
+
+	iounmap(tpci200->info->interface_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_disable_device(tpci200->info->pdev);
+}
+
 static int tpci200_get_clockrate(struct ipack_device *dev)
 {
 	struct tpci200_board *tpci200 = check_slot(dev);
-- 
2.25.1


      parent reply	other threads:[~2021-07-21 11:21 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-21 11:11 [PATCH 1/3] ipack: tpci200: pci_iounmap -> iounmap Dongliang Mu
2021-07-21 11:11 ` [PATCH 2/3] ipack: tpci200: fix many double free issues in tpci200_pci_probe Dongliang Mu
2021-08-05 12:20   ` Greg Kroah-Hartman
2021-08-09  3:40     ` Dongliang Mu
2021-08-09  8:45       ` Greg Kroah-Hartman
2021-07-21 11:11 ` Dongliang Mu [this message]

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