Merge branch 'akpm' (Andrew's patch-bomb)

Merge random patches from Andrew Morton.

* Merge emailed patches from Andrew Morton <akpm@linux-foundation.org>: (32 commits)
  memblock: free allocated memblock_reserved_regions later
  mm: sparse: fix usemap allocation above node descriptor section
  mm: sparse: fix section usemap placement calculation
  xtensa: fix incorrect memset
  shmem: cleanup shmem_add_to_page_cache
  shmem: fix negative rss in memcg memory.stat
  tmpfs: revert SEEK_DATA and SEEK_HOLE
  drivers/rtc/rtc-twl.c: fix threaded IRQ to use IRQF_ONESHOT
  fat: fix non-atomic NFS i_pos read
  MAINTAINERS: add OMAP CPUfreq driver to OMAP Power Management section
  sgi-xp: nested calls to spin_lock_irqsave()
  fs: ramfs: file-nommu: add SetPageUptodate()
  drivers/rtc/rtc-mxc.c: fix irq enabled interrupts warning
  mm/memory_hotplug.c: release memory resources if hotadd_new_pgdat() fails
  h8300/uaccess: add mising __clear_user()
  h8300/uaccess: remove assignment to __gu_val in unhandled case of get_user()
  h8300/time: add missing #include <asm/irq_regs.h>
  h8300/signal: fix typo "statis"
  h8300/pgtable: add missing #include <asm-generic/pgtable.h>
  drivers/rtc/rtc-ab8500.c: ensure correct probing of the AB8500 RTC when Device Tree is enabled
  ...

1 files changed, 10 insertions, 6 deletions

diff --git a/kernel/sys.c b/kernel/sys.c
index e0c8ffc50d7f..2d39a84cd857 100644
--- a/kernel/sys.c
+++ b/kernel/sys.c
@@ -1788,7 +1788,6 @@ SYSCALL_DEFINE1(umask, int, mask)
 #ifdef CONFIG_CHECKPOINT_RESTORE
 static int prctl_set_mm_exe_file(struct mm_struct *mm, unsigned int fd)
 {
-        struct vm_area_struct *vma;
         struct file *exe_file;
         struct dentry *dentry;
         int err;
@@ -1816,13 +1815,17 @@ static int prctl_set_mm_exe_file(struct mm_struct *mm, unsigned int fd)
         down_write(&mm->mmap_sem);
 
         /*
-         * Forbid mm->exe_file change if there are mapped other files.
+         * Forbid mm->exe_file change if old file still mapped.
          */
         err = -EBUSY;
-        for (vma = mm->mmap; vma; vma = vma->vm_next) {
-                if (vma->vm_file && !path_equal(&vma->vm_file->f_path,
-                                                &exe_file->f_path))
-                        goto exit_unlock;
+        if (mm->exe_file) {
+                struct vm_area_struct *vma;
+
+                for (vma = mm->mmap; vma; vma = vma->vm_next)
+                        if (vma->vm_file &&
+                            path_equal(&vma->vm_file->f_path,
+                                       &mm->exe_file->f_path))
+                                goto exit_unlock;
         }
 
         /*
@@ -1835,6 +1838,7 @@ static int prctl_set_mm_exe_file(struct mm_struct *mm, unsigned int fd)
         if (test_and_set_bit(MMF_EXE_FILE_CHANGED, &mm->flags))
                 goto exit_unlock;
 
+        err = 0;
         set_mm_exe_file(mm, exe_file);
 exit_unlock:
         up_write(&mm->mmap_sem);