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-rw-r--r--mm/mmap.c7
1 files changed, 5 insertions, 2 deletions
diff --git a/mm/mmap.c b/mm/mmap.c
index ae919891a087..1620adbbd77f 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -2099,14 +2099,17 @@ static int acct_stack_growth(struct vm_area_struct *vma, unsigned long size, uns
{
struct mm_struct *mm = vma->vm_mm;
struct rlimit *rlim = current->signal->rlim;
- unsigned long new_start;
+ unsigned long new_start, actual_size;
/* address space limit tests */
if (!may_expand_vm(mm, grow))
return -ENOMEM;
/* Stack limit test */
- if (size > ACCESS_ONCE(rlim[RLIMIT_STACK].rlim_cur))
+ actual_size = size;
+ if (size && (vma->vm_flags & (VM_GROWSUP | VM_GROWSDOWN)))
+ actual_size -= PAGE_SIZE;
+ if (actual_size > ACCESS_ONCE(rlim[RLIMIT_STACK].rlim_cur))
return -ENOMEM;
/* mlock limit tests */