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authorChen Gang <gang.chen.5i5j@gmail.com>2015-09-08 15:04:08 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2015-09-08 15:35:28 -0700
commitc9d13f5fc748a02cb5917a798f065681007342b9 (patch)
tree566dafe703c73afee482b789602efd8426833783 /mm
parentbde43c6c9f4f360ae549a0ed9f10a3e62e363aca (diff)
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mm/mmap.c:insert_vm_struct(): check for failure before setting values
There's no point in initializing vma->vm_pgoff if the insertion attempt will be failing anyway. Run the checks before performing the initialization. Signed-off-by: Chen Gang <gang.chen.5i5j@gmail.com> Cc: Michal Hocko <mhocko@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm')
-rw-r--r--mm/mmap.c13
1 files changed, 7 insertions, 6 deletions
diff --git a/mm/mmap.c b/mm/mmap.c
index 7a3b12399f06..b6be3249f0a9 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -2871,6 +2871,13 @@ int insert_vm_struct(struct mm_struct *mm, struct vm_area_struct *vma)
struct vm_area_struct *prev;
struct rb_node **rb_link, *rb_parent;
+ if (find_vma_links(mm, vma->vm_start, vma->vm_end,
+ &prev, &rb_link, &rb_parent))
+ return -ENOMEM;
+ if ((vma->vm_flags & VM_ACCOUNT) &&
+ security_vm_enough_memory_mm(mm, vma_pages(vma)))
+ return -ENOMEM;
+
/*
* The vm_pgoff of a purely anonymous vma should be irrelevant
* until its first write fault, when page's anon_vma and index
@@ -2887,12 +2894,6 @@ int insert_vm_struct(struct mm_struct *mm, struct vm_area_struct *vma)
BUG_ON(vma->anon_vma);
vma->vm_pgoff = vma->vm_start >> PAGE_SHIFT;
}
- if (find_vma_links(mm, vma->vm_start, vma->vm_end,
- &prev, &rb_link, &rb_parent))
- return -ENOMEM;
- if ((vma->vm_flags & VM_ACCOUNT) &&
- security_vm_enough_memory_mm(mm, vma_pages(vma)))
- return -ENOMEM;
vma_link(mm, vma, prev, rb_link, rb_parent);
return 0;