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authorAl Viro <viro@ZenIV.linux.org.uk>2013-11-20 22:16:36 (GMT)
committerLinus Torvalds <torvalds@linux-foundation.org>2013-11-20 22:22:14 (GMT)
commit2a46eed54a28c1e3de701ca4237ce4f8bebf14c6 (patch)
treed1bb3671fed7746110175a480b72a543bfd3d271 /arch/x86/mm
parent82023bb7f75b0052f40d3e74169d191c3e4e6286 (diff)
Wrong page freed on preallocate_pmds() failure exit
Note that pmds[i] is simply uninitialized at that point... Granted, it's very hard to hit (you need split page locks *and* kmalloc(sizeof(spinlock_t), GFP_KERNEL) failing), but the code is obviously bogus. Introduced by commit 09ef4939850a ("x86: add missed pgtable_pmd_page_ctor/dtor calls for preallocated pmds") Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Cc: Ingo Molnar <mingo@kernel.org> Cc: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch/x86/mm')
-rw-r--r--arch/x86/mm/pgtable.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/x86/mm/pgtable.c b/arch/x86/mm/pgtable.c
index a7cccb6..36aa999 100644
--- a/arch/x86/mm/pgtable.c
+++ b/arch/x86/mm/pgtable.c
@@ -209,7 +209,7 @@ static int preallocate_pmds(pmd_t *pmds[])
if (!pmd)
failed = true;
if (pmd && !pgtable_pmd_page_ctor(virt_to_page(pmd))) {
- free_page((unsigned long)pmds[i]);
+ free_page((unsigned long)pmd);
pmd = NULL;
failed = true;
}

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