procfs: also fix proc_reg_get_unmapped_area() for !MMU case

Commit fad1a86e25e0 ("procfs: call default get_unmapped_area on
MMU-present architectures"), as its title says, took care of only the
MMU case, leaving the !MMU side still in the regressed state (returning
-EIO in all cases where pde->proc_fops->get_unmapped_area is NULL).

From the fad1a86e25e0 changelog:

 "Commit c4fe24485729 ("sparc: fix PCI device proc file mmap(2)") added
  proc_reg_get_unmapped_area in proc_reg_file_ops and
  proc_reg_file_ops_no_compat, by which now mmap always returns EIO if
  get_unmapped_area method is not defined for the target procfs file, which
  causes regression of mmap on /proc/vmcore.

  To address this issue, like get_unmapped_area(), call default
  current->mm->get_unmapped_area on MMU-present architectures if
  pde->proc_fops->get_unmapped_area, i.e.  the one in actual file operation
  in the procfs file, is not defined"

Signed-off-by: Jan Beulich <jbeulich@suse.com>
Cc: HATAYAMA Daisuke <d.hatayama@jp.fujitsu.com>
Cc: Alexey Dobriyan <adobriyan@gmail.com>
Cc: David S. Miller <davem@davemloft.net>
Cc: <stable@vger.kernel.org>	[3.12.x]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 9 insertions, 5 deletions

diff --git a/fs/proc/inode.c b/fs/proc/inode.c
index 28955d4b7218..124fc43c7090 100644
--- a/fs/proc/inode.c
+++ b/fs/proc/inode.c
@@ -292,16 +292,20 @@ proc_reg_get_unmapped_area(struct file *file, unsigned long orig_addr,
 {
         struct proc_dir_entry *pde = PDE(file_inode(file));
         unsigned long rv = -EIO;
-        unsigned long (*get_area)(struct file *, unsigned long, unsigned long,
-                                  unsigned long, unsigned long) = NULL;
+
         if (use_pde(pde)) {
+                typeof(proc_reg_get_unmapped_area) *get_area;
+
+                get_area = pde->proc_fops->get_unmapped_area;
 #ifdef CONFIG_MMU
-                get_area = current->mm->get_unmapped_area;
+                if (!get_area)
+                        get_area = current->mm->get_unmapped_area;
 #endif
-                if (pde->proc_fops->get_unmapped_area)
-                        get_area = pde->proc_fops->get_unmapped_area;
+
                 if (get_area)
                         rv = get_area(file, orig_addr, len, pgoff, flags);
+                else
+                        rv = orig_addr;
                 unuse_pde(pde);
         }
         return rv;