proc: Don't let Google Camera and Settings run in the background

[sagit-ice-cold/kernel_xiaomi_msm8998.git] / fs / userfaultfd.c

diff --git a/fs/userfaultfd.c b/fs/userfaultfd.c
index 08cc09b..85877c5 100644 (file)
--- a/fs/userfaultfd.c
+++ b/fs/userfaultfd.c
@@ -431,6 +431,7 @@ static int userfaultfd_release(struct inode *inode, struct file *file)
        /* len == 0 means wake all */
        struct userfaultfd_wake_range range = { .len = 0, };
        unsigned long new_flags;
+       bool still_valid;
 
        ACCESS_ONCE(ctx->released) = true;
 
@@ -446,8 +447,7 @@ static int userfaultfd_release(struct inode *inode, struct file *file)
         * taking the mmap_sem for writing.
         */
        down_write(&mm->mmap_sem);
-       if (!mmget_still_valid(mm))
-               goto skip_mm;
+       still_valid = mmget_still_valid(mm);
        prev = NULL;
        for (vma = mm->mmap; vma; vma = vma->vm_next) {
                cond_resched();
@@ -458,20 +458,21 @@ static int userfaultfd_release(struct inode *inode, struct file *file)
                        continue;
                }
                new_flags = vma->vm_flags & ~(VM_UFFD_MISSING | VM_UFFD_WP);
-               prev = vma_merge(mm, prev, vma->vm_start, vma->vm_end,
-                                new_flags, vma->anon_vma,
-                                vma->vm_file, vma->vm_pgoff,
-                                vma_policy(vma),
-                                NULL_VM_UFFD_CTX,
-                                vma_get_anon_name(vma));
-               if (prev)
-                       vma = prev;
-               else
-                       prev = vma;
+               if (still_valid) {
+                       prev = vma_merge(mm, prev, vma->vm_start, vma->vm_end,
+                                        new_flags, vma->anon_vma,
+                                        vma->vm_file, vma->vm_pgoff,
+                                        vma_policy(vma),
+                                        NULL_VM_UFFD_CTX,
+                                        vma_get_anon_name(vma));
+                       if (prev)
+                               vma = prev;
+                       else
+                               prev = vma;
+               }
                vma->vm_flags = new_flags;
                vma->vm_userfaultfd_ctx = NULL_VM_UFFD_CTX;
        }
-skip_mm:
        up_write(&mm->mmap_sem);
        mmput(mm);
 wakeup: