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mm/mremap.c: call pud_free() after fail calling pmd_alloc() 

In alloc_new_pmd(), if pud_alloc() was called successfully, but
pmd_alloc() fails, avoid leaking `pud'.

Signed-off-by: Chen Gang <gang.chen@asianux.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Chen Gang 2013-09-11 14:22:43 -07:00 committed by Linus Torvalds
parent 762216ab4e
commit 1ecfd533f4
1 changed files with 4 additions and 1 deletions
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5
mm/mremap.c
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@ -25,6 +25,7 @@
#include <asm/uaccess.h> #include <asm/uaccess.h>
#include <asm/cacheflush.h> #include <asm/cacheflush.h>
#include <asm/tlbflush.h> #include <asm/tlbflush.h>
#include <asm/pgalloc.h>
#include "internal.h" #include "internal.h"
@ -62,8 +63,10 @@ static pmd_t *alloc_new_pmd(struct mm_struct *mm, struct vm_area_struct *vma,
return NULL; return NULL;
pmd = pmd_alloc(mm, pud, addr); pmd = pmd_alloc(mm, pud, addr);
if (!pmd) if (!pmd) {
pud_free(mm, pud);
return NULL; return NULL;
}
VM_BUG_ON(pmd_trans_huge(*pmd)); VM_BUG_ON(pmd_trans_huge(*pmd));