1 files changed, 9 insertions, 6 deletions

diff --git a/mm/mmap.c b/mm/mmap.c
index 2ec8eb5a9cdd..e27e0cf0de03 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -259,7 +259,7 @@ SYSCALL_DEFINE1(brk, unsigned long, brk)
          * randomize_va_space to 2, which will still cause mm->start_brk
          * to be arbitrarily shifted
          */
-        if (mm->start_brk > PAGE_ALIGN(mm->end_data))
+        if (current->brk_randomized)
                 min_brk = mm->start_brk;
         else
                 min_brk = mm->end_data;
@@ -1814,11 +1814,14 @@ static int expand_downwards(struct vm_area_struct *vma,
                 size = vma->vm_end - address;
                 grow = (vma->vm_start - address) >> PAGE_SHIFT;
 
-                error = acct_stack_growth(vma, size, grow);
-                if (!error) {
-                        vma->vm_start = address;
-                        vma->vm_pgoff -= grow;
-                        perf_event_mmap(vma);
+                error = -ENOMEM;
+                if (grow <= vma->vm_pgoff) {
+                        error = acct_stack_growth(vma, size, grow);
+                        if (!error) {
+                                vma->vm_start = address;
+                                vma->vm_pgoff -= grow;
+                                perf_event_mmap(vma);
+                        }
                 }
         }
         vma_unlock_anon_vma(vma);