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mm/damon/paddr: fix folio_size() call after folio_put() in damon_pa_young()

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Patch series "mm/damon/paddr: Fix folio-use-after-put bugs".

There are two folio accesses after folio_put() in mm/damon/paddr.c file. 
Fix those.


This patch (of 2):

damon_pa_young() is accessing a folio via folio_size() after folio_put()
for the folio has invoked.  Fix it.

Link: https://lkml.kernel.org/r/20230304193949.296391-1-sj@kernel.org
Link: https://lkml.kernel.org/r/20230304193949.296391-2-sj@kernel.org
Fixes: 397b0c3a58 ("mm/damon/paddr: remove folio_sz field from damon_pa_access_chk_result")
Signed-off-by: SeongJae Park <sj@kernel.org>
Reviewed-by: Kefeng Wang <wangkefeng.wang@huawei.com>
Reviewed-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Vishal Moola (Oracle) <vishal.moola@gmail.com>
Cc: <stable@vger.kernel.org>	[6.2.x]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
SeongJae Park 2023-03-04 19:39:48 +00:00 committed by Andrew Morton
parent 90410bcf87
commit 751688b8be
1 changed files with 1 additions and 2 deletions
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3
mm/damon/paddr.c
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@ -130,7 +130,6 @@ static bool damon_pa_young(unsigned long paddr, unsigned long *folio_sz)
accessed = false;
else
accessed = true;
folio_put(folio);
goto out;
}
@ -144,10 +143,10 @@ static bool damon_pa_young(unsigned long paddr, unsigned long *folio_sz)
if (need_lock)
folio_unlock(folio);
folio_put(folio);
out:
*folio_sz = folio_size(folio);
folio_put(folio);
return accessed;
}