linux-kernel - [16/17] Staging: comedi: jr3_pci: Dont ioremap too much space. Check result.

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Message-Id: <20110311204110.957498798@clark.kroah.org>
Date:	Fri, 11 Mar 2011 12:40:17 -0800
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Ian Abbott <abbotti@....co.uk>
Subject: [16/17] Staging: comedi: jr3_pci: Dont ioremap too much space. Check result.

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

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

From: Ian Abbott <abbotti@....co.uk>

commit fa5c5f4ce0c9ba03a670c640cad17e14cb35678b upstream.

For the JR3/PCI cards, the size of the PCIBAR0 region depends on the
number of channels.  Don't try and ioremap space for 4 channels if the
card has fewer channels.  Also check for ioremap failure.

Thanks to Anders Blomdell for input and Sami Hussein for testing.

Signed-off-by: Ian Abbott <abbotti@....co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 drivers/staging/comedi/drivers/jr3_pci.c |    7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

--- a/drivers/staging/comedi/drivers/jr3_pci.c
+++ b/drivers/staging/comedi/drivers/jr3_pci.c
@@ -856,8 +856,11 @@ static int jr3_pci_attach(struct comedi_
 	}
 
 	devpriv->pci_enabled = 1;
-	devpriv->iobase =
-	    ioremap(pci_resource_start(card, 0), sizeof(struct jr3_t));
+	devpriv->iobase = ioremap(pci_resource_start(card, 0),
+			offsetof(struct jr3_t, channel[devpriv->n_channels]));
+	if (!devpriv->iobase)
+		return -ENOMEM;
+
 	result = alloc_subdevices(dev, devpriv->n_channels);
 	if (result < 0)
 		goto out;


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