linux-kernel - Re: ext3 oops on shutdown

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Message-Id: <20061025.230652.71090033.davem@davemloft.net>
Date:	Wed, 25 Oct 2006 23:06:52 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	linux-kernel@...r.kernel.org
Subject: Re: ext3 oops on shutdown

From: David Miller <davem@...emloft.net>
Date: Wed, 25 Oct 2006 00:51:34 -0700 (PDT)

> It's probably some sparc64 issue, maybe even some error wrt.  freeing
> up init memory.  I'll try to track it down.  I'm actually quite
> curious what this bug is :-)

Yep, a sparc64 bug, I'll push this to Linus shortly...

commit 2506be0657c7bd1befdb616fb0e86d87c6a288cd
Author: David S. Miller <davem@...set.davemloft.net>
Date:   Wed Oct 25 22:33:07 2006 -0700

    [SPARC64]: Fix memory corruption in pci_4u_free_consistent().
    
    The second argument to free_npages() was being incorrectly
    calculated, which would thus access far past the end of the
    arena->map[] bitmap.
    
    Signed-off-by: David S. Miller <davem@...emloft.net>

diff --git a/arch/sparc64/kernel/pci_iommu.c b/arch/sparc64/kernel/pci_iommu.c
index 82e5455..2e7f142 100644
--- a/arch/sparc64/kernel/pci_iommu.c
+++ b/arch/sparc64/kernel/pci_iommu.c
@@ -281,7 +281,7 @@ static void pci_4u_free_consistent(struc
 
 	spin_lock_irqsave(&iommu->lock, flags);
 
-	free_npages(iommu, dvma, npages);
+	free_npages(iommu, dvma - iommu->page_table_map_base, npages);
 
 	spin_unlock_irqrestore(&iommu->lock, flags);
 
-
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