linux-kernel - [PATCH] [21/98] mmc: sdhci-pci: Fix error case in sdhci_pci_probe

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Date:	Tue, 26 Jul 2011 17:35:13 -0700 (PDT)
From:	Andi Kleen <andi@...stfloor.org>
To:	cjb@...top.org, gregkh@...e.de, ak@...ux.intel.com,
	linux-kernel@...r.kernel.org, stable@...nel.org,
	tim.bird@...sony.com, linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Subject: [PATCH] [21/98] mmc: sdhci-pci: Fix error case in sdhci_pci_probe_slot()

2.6.35-longterm review patch.  If anyone has any objections, please let me know.

------------------
From: Chris Ball <cjb@...top.org>

commit 9fdcdbb0d84922e7ccda2f717a04ea62629f7e18 upstream.

If pci_ioremap_bar() fails during probe, we "goto release;" and free the
host, but then we return 0 -- which tells sdhci_pci_probe() that the probe
succeeded.  Since we think the probe succeeded, when we unload sdhci we'll
go to sdhci_pci_remove_slot() and it will try to dereference slot->host,
which is now NULL because we freed it in the error path earlier.

The patch simply sets ret appropriately, so that sdhci_pci_probe() will
detect the failure immediately and bail out.

Signed-off-by: Chris Ball <cjb@...top.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>
Signed-off-by: Andi Kleen <ak@...ux.intel.com>

---
 drivers/mmc/host/sdhci-pci.c |    1 +
 1 file changed, 1 insertion(+)

Index: linux-2.6.35.y/drivers/mmc/host/sdhci-pci.c
===================================================================
--- linux-2.6.35.y.orig/drivers/mmc/host/sdhci-pci.c
+++ linux-2.6.35.y/drivers/mmc/host/sdhci-pci.c
@@ -653,6 +653,7 @@ static struct sdhci_pci_slot * __devinit
 	host->ioaddr = pci_ioremap_bar(pdev, bar);
 	if (!host->ioaddr) {
 		dev_err(&pdev->dev, "failed to remap registers\n");
+		ret = -ENOMEM;
 		goto release;
 	}
 
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