linux-kernel - [PATCH] [87/106] intel-iommu: Fix get_domain_for

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Date:	Tue, 26 Apr 2011 14:14:09 -0700 (PDT)
From:	Andi Kleen <andi@...stfloor.org>
To:	alex.williamson@...hat.com, ddutile@...hat.com,
	David.Woodhouse@...el.com, gregkh@...e.de, ak@...ux.intel.com,
	linux-kernel@...r.kernel.org, stable@...nel.org,
	tim.bird@...sony.com
Subject: [PATCH] [87/106] intel-iommu: Fix get_domain_for_dev() error path

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

------------------
From: Alex Williamson <alex.williamson@...hat.com>

commit 2fe9723df8e45fd247782adea244a5e653c30bf4 upstream.

If we run out of domain_ids and fail iommu_attach_domain(), we
fall into domain_exit() without having setup enough of the
domain structure for this to do anything useful.  In fact, it
typically runs off into the weeds walking the bogus domain->devices
list.  Just free the domain.

Signed-off-by: Alex Williamson <alex.williamson@...hat.com>
Acked-by: Donald Dutile <ddutile@...hat.com>
Signed-off-by: David Woodhouse <David.Woodhouse@...el.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>
Signed-off-by: Andi Kleen <ak@...ux.intel.com>

---
 drivers/pci/intel-iommu.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Index: linux-2.6.35.y/drivers/pci/intel-iommu.c
===================================================================
--- linux-2.6.35.y.orig/drivers/pci/intel-iommu.c
+++ linux-2.6.35.y/drivers/pci/intel-iommu.c
@@ -1835,7 +1835,7 @@ static struct dmar_domain *get_domain_fo
 
 	ret = iommu_attach_domain(domain, iommu);
 	if (ret) {
-		domain_exit(domain);
+		free_domain_mem(domain);
 		goto error;
 	}
 
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