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From: Dan Carpenter <dan.carpenter@oracle.com>
To: Andrew Morton <akpm@linux-foundation.org>,
	Mike Kravetz <mike.kravetz@oracle.com>
Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>,
	Jan Kara <jack@suse.cz>,
	Ross Zwisler <ross.zwisler@linux.intel.com>,
	Michal Hocko <mhocko@suse.com>,
	Lorenzo Stoakes <lstoakes@gmail.com>,
	"Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>,
	Dan Williams <dan.j.williams@intel.com>,
	linux-mm@kvack.org, kernel-janitors@vger.kernel.org
Subject: [patch linux-next] userfaultfd: hugetlbfs: unmap the correct pointer
Date: Thu, 12 Jan 2017 19:20:52 +0000	[thread overview]
Message-ID: <20170112192052.GB12157@mwanda> (raw)

kunmap_atomic() and kunmap() take different pointers.  People often get
these mixed up.

Fixes: 16374db2e9a0 ("userfaultfd: hugetlbfs: fix __mcopy_atomic_hugetlb retry/error processing")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>

diff --git a/mm/memory.c b/mm/memory.c
index 6012a05..dfd3604 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -4172,7 +4172,7 @@ long copy_huge_page_from_user(struct page *dst_page,
 				(const void __user *)(src + i * PAGE_SIZE),
 				PAGE_SIZE);
 		if (allow_pagefault)
-			kunmap(page_kaddr);
+			kunmap(dst_page + 1);
 		else
 			kunmap_atomic(page_kaddr);
 

WARNING: multiple messages have this Message-ID (diff)
From: Dan Carpenter <dan.carpenter@oracle.com>
To: Andrew Morton <akpm@linux-foundation.org>,
	Mike Kravetz <mike.kravetz@oracle.com>
Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>,
	Jan Kara <jack@suse.cz>,
	Ross Zwisler <ross.zwisler@linux.intel.com>,
	Michal Hocko <mhocko@suse.com>,
	Lorenzo Stoakes <lstoakes@gmail.com>,
	"Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>,
	Dan Williams <dan.j.williams@intel.com>,
	linux-mm@kvack.org, kernel-janitors@vger.kernel.org
Subject: [patch linux-next] userfaultfd: hugetlbfs: unmap the correct pointer
Date: Thu, 12 Jan 2017 22:20:52 +0300	[thread overview]
Message-ID: <20170112192052.GB12157@mwanda> (raw)

kunmap_atomic() and kunmap() take different pointers.  People often get
these mixed up.

Fixes: 16374db2e9a0 ("userfaultfd: hugetlbfs: fix __mcopy_atomic_hugetlb retry/error processing")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>

diff --git a/mm/memory.c b/mm/memory.c
index 6012a05..dfd3604 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -4172,7 +4172,7 @@ long copy_huge_page_from_user(struct page *dst_page,
 				(const void __user *)(src + i * PAGE_SIZE),
 				PAGE_SIZE);
 		if (allow_pagefault)
-			kunmap(page_kaddr);
+			kunmap(dst_page + 1);
 		else
 			kunmap_atomic(page_kaddr);
 

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             reply	other threads:[~2017-01-12 19:20 UTC|newest]

Thread overview: 24+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-01-12 19:20 Dan Carpenter [this message]
2017-01-12 19:20 ` [patch linux-next] userfaultfd: hugetlbfs: unmap the correct pointer Dan Carpenter
2017-01-12 19:33 ` Michal Hocko
2017-01-12 19:33   ` Michal Hocko
2017-01-13  8:16   ` Dan Carpenter
2017-01-13  8:16     ` Dan Carpenter
2017-01-13  8:26     ` Michal Hocko
2017-01-13  8:26       ` Michal Hocko
2017-01-13  8:40       ` Dan Carpenter
2017-01-13  8:40         ` Dan Carpenter
2017-01-13  8:26   ` [patch v2 " Dan Carpenter
2017-01-13  8:26     ` Dan Carpenter
2017-01-13  8:40     ` Michal Hocko
2017-01-13  8:40       ` Michal Hocko
2017-01-13 16:29       ` Mike Kravetz
2017-01-13 16:29         ` Mike Kravetz
2017-01-14  0:02     ` Hugh Dickins
2017-01-14  0:02       ` Hugh Dickins
2017-01-14  0:13       ` Andrew Morton
2017-01-14  0:13         ` Andrew Morton
2017-01-14  6:56         ` Dan Carpenter
2017-01-14  6:56           ` Dan Carpenter
2017-01-14  6:55       ` Dan Carpenter
2017-01-14  6:55         ` Dan Carpenter

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