tree f6b95cb55c397b738b8509c03d895fa8e2bd6f21
parent c6400ba7e13a41539342f1b6e1f9e78419cb0148
author Matthew Wilcox <matthew.r.wilcox@intel.com> 1454461077 -0800
committer Linus Torvalds <torvalds@linux-foundation.org> 1454516923 -0800

mm: fix memory leak in copy_huge_pmd()

We allocate a pgtable but do not attach it to anything if the PMD is in
a DAX VMA, causing it to leak.

We certainly try to not free pgtables associated with the huge zero page
if the zero page is in a DAX VMA, so I think this is the right solution.
This needs to be properly audited.

Signed-off-by: Matthew Wilcox <matthew.r.wilcox@intel.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Acked-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>