Patch "iommu/amd: Fix incorrect error handling in amd_iommu_bind_pasid()" has been added to the 4.11-stable tree

gregkh
2017-07-03T13:03:13Z

This is a note to let you know that I've just added the patch titled

iommu/amd: Fix incorrect error handling in amd_iommu_bind_pasid()

to the 4.11-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
iommu-amd-fix-incorrect-error-handling-in-amd_iommu_bind_pasid.patch
and it can be found in the queue-4.11 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.

>From 73dbd4a4230216b6a5540a362edceae0c9b4876b Mon Sep 17 00:00:00 2001
From: Pan Bian <bianpan2016@163.com>
Date: Sun, 23 Apr 2017 18:23:21 +0800
Subject: iommu/amd: Fix incorrect error handling in amd_iommu_bind_pasid()

From: Pan Bian <bianpan2016@163.com>

commit 73dbd4a4230216b6a5540a362edceae0c9b4876b upstream.

In function amd_iommu_bind_pasid(), the control flow jumps
to label out_free when pasid_state->mm and mm is NULL. And
mmput(mm) is called. In function mmput(mm), mm is
referenced without validation. This will result in a NULL
dereference bug. This patch fixes the bug.

Signed-off-by: Pan Bian <bianpan2016@163.com>
Fixes: f0aac63b873b ('iommu/amd: Don't hold a reference to mm_struct')
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
drivers/iommu/amd_iommu_v2.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/iommu/amd_iommu_v2.c
+++ b/drivers/iommu/amd_iommu_v2.c
@@ -696,9 +696,9 @@ out_clear_state:

out_unregister:
mmu_notifier_unregister(&pasid_state->mn, mm);
+ mmput(mm);

out_free:
- mmput(mm);
free_pasid_state(pasid_state);

out:

Patches currently in stable-queue which might be from bianpan2016@163.com are

queue-4.11/iommu-amd-fix-incorrect-error-handling-in-amd_iommu_bind_pasid.patch