proc: check vma->vm_file before dereferencing

Commit 7b540d0646ce ("proc_map_files_readdir(): don't bother with
grabbing files") switched proc_map_files_readdir() to use @f_mode
directly instead of grabbing @file reference, but same time the test for
@vm_file presence was lost leading to nil dereference.  The patch brings
the test back.

The all proc_map_files feature is CONFIG_CHECKPOINT_RESTORE wrapped
(which is set to 'n' by default) so the bug doesn't affect regular
kernels.

The regression is 3.7-rc1 only as far as I can tell.

[gorcunov@openvz.org: provided changelog]
Signed-off-by: Stanislav Kinsbursky <skinsbursky@parallels.com>
Acked-by: Cyrill Gorcunov <gorcunov@openvz.org>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 3 insertions, 2 deletions

diff --git a/fs/proc/base.c b/fs/proc/base.c
index 3c231adf845..9e28356a959 100644
--- a/fs/proc/base.c
+++ b/fs/proc/base.c
@@ -1877,8 +1877,9 @@ static struct dentry *proc_map_files_lookup(struct inode *dir,
         if (!vma)
                 goto out_no_vma;
 
-        result = proc_map_files_instantiate(dir, dentry, task,
-                        (void *)(unsigned long)vma->vm_file->f_mode);
+        if (vma->vm_file)
+                result = proc_map_files_instantiate(dir, dentry, task,
+                                (void *)(unsigned long)vma->vm_file->f_mode);
 
 out_no_vma:
         up_read(&mm->mmap_sem);