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mm/hwpoison-inject: fix refcounting in no-injection case

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Hwpoison injection via debugfs:hwpoison/corrupt-pfn takes a refcount of
the target page.  But current code doesn't release it if the target page
is not supposed to be injected, which results in memory leak.  This patch
simply adds the refcount releasing code.

Signed-off-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Acked-by: Dean Nelson <dnelson@redhat.com>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Hidetoshi Seto <seto.hidetoshi@jp.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Naoya Horiguchi 2015-05-05 16:23:49 -07:00 committed by Linus Torvalds
parent 602498f9aa
commit 7ea434a4eb
1 changed files with 5 additions and 2 deletions
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7
mm/hwpoison-inject.c
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@ -40,7 +40,7 @@ static int hwpoison_inject(void *data, u64 val)
* This implies unable to support non-LRU pages.
*/
if (!PageLRU(p) && !PageHuge(p))
return 0;
goto put_out;
/*
* do a racy check with elevated page count, to make sure PG_hwpoison
@ -52,11 +52,14 @@ static int hwpoison_inject(void *data, u64 val)
err = hwpoison_filter(hpage);
unlock_page(hpage);
if (err)
return 0;
goto put_out;
inject:
pr_info("Injecting memory failure at pfn %#lx\n", pfn);
return memory_failure(pfn, 18, MF_COUNT_INCREASED);
put_out:
put_page(hpage);
return 0;
}
static int hwpoison_unpoison(void *data, u64 val)