linux-kernel - [PATCH v9 04/11] PCI: Fix a device reference count leakage issue in pci_dev

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Message-Id: <1358495602-22867-5-git-send-email-yinghai@kernel.org>
Date:	Thu, 17 Jan 2013 23:53:15 -0800
From:	Yinghai Lu <yinghai@...nel.org>
To:	Bjorn Helgaas <bhelgaas@...gle.com>,
	"Rafael J. Wysocki" <rjw@...k.pl>, Len Brown <lenb@...nel.org>,
	Taku Izumi <izumi.taku@...fujitsu.com>,
	Jiang Liu <jiang.liu@...wei.com>
Cc:	linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-acpi@...r.kernel.org, Yinghai Lu <yinghai@...nel.org>
Subject: [PATCH v9 04/11] PCI: Fix a device reference count leakage issue in pci_dev_present()

From: Jiang Liu <jiang.liu@...wei.com>

Function pci_get_dev_by_id() will hold a reference count on the pci device
returned, so pci_dev_present() should release the corresponding reference
count to avoid memory leakage.

Signed-off-by: Jiang Liu <jiang.liu@...wei.com>
Acked-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
Signed-off-by: Yinghai Lu <yinghai@...nel.org>
---
 drivers/pci/search.c |   10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/drivers/pci/search.c b/drivers/pci/search.c
index bf969ba..d0627fa 100644
--- a/drivers/pci/search.c
+++ b/drivers/pci/search.c
@@ -319,13 +319,13 @@ int pci_dev_present(const struct pci_device_id *ids)
 	WARN_ON(in_interrupt());
 	while (ids->vendor || ids->subvendor || ids->class_mask) {
 		found = pci_get_dev_by_id(ids, NULL);
-		if (found)
-			goto exit;
+		if (found) {
+			pci_dev_put(found);
+			return 1;
+		}
 		ids++;
 	}
-exit:
-	if (found)
-		return 1;
+
 	return 0;
 }
 EXPORT_SYMBOL(pci_dev_present);
-- 
1.7.10.4

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