linux-kernel - [PATCH 2/7] staging: slicoss: fix multiple free-after-free in slic_entry

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Date:	Mon,  5 May 2014 21:02:32 -0700
From:	David Matlack <dmatlack@...gle.com>
To:	gregkh@...uxfoundation.org
Cc:	liodot@...il.com, charrer@...critech.com,
	linux-kernel@...r.kernel.org, devel@...verdev.osuosl.org,
	David Matlack <dmatlack@...gle.com>
Subject: [PATCH 2/7] staging: slicoss: fix multiple free-after-free in slic_entry_remove

This patch fixes two free-after-free bugs in slic_entry_remove.
Specifically, slic_unmap_mmio_space() iounmaps adapter->slic_regs,
which is the same region of memory as dev->base_addr (iounmap-ed
a few lines later).

Next, both release_mem_region() and pci_release_regions() are called
on the same pci_dev struct.

Signed-off-by: David Matlack <dmatlack@...gle.com>
---
 drivers/staging/slicoss/slicoss.c | 8 --------
 1 file changed, 8 deletions(-)

diff --git a/drivers/staging/slicoss/slicoss.c b/drivers/staging/slicoss/slicoss.c
index 6113b90..452aa02 100644
--- a/drivers/staging/slicoss/slicoss.c
+++ b/drivers/staging/slicoss/slicoss.c
@@ -2955,8 +2955,6 @@ static void slic_card_cleanup(struct sliccard *card)
 static void slic_entry_remove(struct pci_dev *pcidev)
 {
 	struct net_device *dev = pci_get_drvdata(pcidev);
-	u32 mmio_start = 0;
-	uint mmio_len = 0;
 	struct adapter *adapter = netdev_priv(dev);
 	struct sliccard *card;
 	struct mcast_address *mcaddr, *mlist;
@@ -2965,12 +2963,6 @@ static void slic_entry_remove(struct pci_dev *pcidev)
 	slic_unmap_mmio_space(adapter);
 	unregister_netdev(dev);
 
-	mmio_start = pci_resource_start(pcidev, 0);
-	mmio_len = pci_resource_len(pcidev, 0);
-
-	release_mem_region(mmio_start, mmio_len);
-
-	iounmap((void __iomem *)dev->base_addr);
 	/* free multicast addresses */
 	mlist = adapter->mcastaddrs;
 	while (mlist) {
-- 
1.9.2

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