From: Christophe Jaillet <christophe.jaillet@xxxxxxxxxx>
Commit 0e0da48dee8d ("parisc: mm: don't count preallocated pmds")
introduced a memory leak.
After this commit, the 'return' statement in pmd_free is executed in all
cases. Even for pmd that are not attached to the pgd. So 'free_pages'
can never be called anymore, leading to a memory leak.
Signed-off-by: Christophe JAILLET <christophe.jaillet@xxxxxxxxxx>
Acked-by: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx>
Acked-by: Mikulas Patocka <mpatocka@xxxxxxxxxx>
Acked-by: Helge Deller <deller@xxxxxx>
Cc: stable@xxxxxxxxxxxxxxx # v4.0+
Signed-off-by: Helge Deller <deller@xxxxxx>
---
arch/parisc/include/asm/pgalloc.h | 3 ++-
1 files changed, 2 insertions(+), 1 deletions(-)
diff --git a/arch/parisc/include/asm/pgalloc.h b/arch/parisc/include/asm/pgalloc.h
index 3a08eae..3edbb9f 100644
--- a/arch/parisc/include/asm/pgalloc.h
+++ b/arch/parisc/include/asm/pgalloc.h
@@ -72,7 +72,7 @@ static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long address)
static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd)
{
- if(pmd_flag(*pmd) & PxD_FLAG_ATTACHED)
+ if (pmd_flag(*pmd) & PxD_FLAG_ATTACHED) {
/*
* This is the permanent pmd attached to the pgd;
* cannot free it.
@@ -81,6 +81,7 @@ static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd)
*/
mm_inc_nr_pmds(mm);
return;
+ }
free_pages((unsigned long)pmd, PMD_ORDER);
}
--
1.7.1
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