linux-kernel - [PATCH 07/91] mmc: sdhci-pci: Fix error case in sdhci_pci_probe

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Date:	Sun, 05 Feb 2012 23:09:56 +0100
From:	Willy Tarreau <w@....eu>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	Chris Ball <cjb@...top.org>, Greg KH <gregkh@...uxfoundation.org>
Subject: [PATCH 07/91] mmc: sdhci-pci: Fix error case in sdhci_pci_probe_slot()

2.6.27-longterm review patch.  If anyone has any objections, please let us know.

------------------

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>
---
 drivers/mmc/host/sdhci-pci.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

Index: longterm-2.6.27/drivers/mmc/host/sdhci-pci.c
===================================================================
--- longterm-2.6.27.orig/drivers/mmc/host/sdhci-pci.c	2012-02-05 22:34:34.824917273 +0100
+++ longterm-2.6.27/drivers/mmc/host/sdhci-pci.c	2012-02-05 22:34:35.914915549 +0100
@@ -547,6 +547,7 @@
 	host->ioaddr = ioremap_nocache(addr, pci_resource_len(pdev, bar));
 	if (!host->ioaddr) {
 		dev_err(&pdev->dev, "failed to remap registers\n");
+		ret = -ENOMEM;
 		goto release;
 	}
 


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