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xen-pciback: fix up cleanup path when alloc fails 

When allocating a pciback device fails, clear the private
field. This could lead to an use-after free, however
the 'really_probe' takes care of setting
dev_set_drvdata(dev, NULL) in its failure path (which we would
exercise if the ->probe function failed), so we we
are OK. However lets be defensive as the code can change.

Going forward we should clean up the pci_set_drvdata(dev, NULL)
in the various code-base. That will be for another day.

Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Reported-by: Jonathan Creekmore <jonathan.creekmore@gmail.com>
Signed-off-by: Doug Goldstein <cardoe@cardoe.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
This commit is contained in:
Doug Goldstein 2015-11-26 14:32:39 -06:00 committed by Konrad Rzeszutek Wilk
parent 408fb0e5aa
commit 584a561a6f
1 changed files with 3 additions and 1 deletions
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4
drivers/xen/xen-pciback/xenbus.c
View File

@ -44,7 +44,6 @@ static struct xen_pcibk_device *alloc_pdev(struct xenbus_device *xdev)
dev_dbg(&xdev->dev, "allocated pdev @ 0x%p\n", pdev); dev_dbg(&xdev->dev, "allocated pdev @ 0x%p\n", pdev);
pdev->xdev = xdev; pdev->xdev = xdev;
dev_set_drvdata(&xdev->dev, pdev);
mutex_init(&pdev->dev_lock); mutex_init(&pdev->dev_lock);
@ -58,6 +57,9 @@ static struct xen_pcibk_device *alloc_pdev(struct xenbus_device *xdev)
kfree(pdev); kfree(pdev);
pdev = NULL; pdev = NULL;
} }
dev_set_drvdata(&xdev->dev, pdev);
out: out:
return pdev; return pdev;
} }