[PATCH 3.18 11/45] cifs: Fix missing put_xid in cifs_file_strict_mmap

[Greg Kroah-Hartman]

3.18-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Matthew Wilcox <mawil...@microsoft.com>

commit f04a703c3d613845ae3141bfaf223489de8ab3eb upstream.

If cifs_zap_mapping() returned an error, we would return without putting
the xid that we got earlier.  Restructure cifs_file_strict_mmap() and
cifs_file_mmap() to be more similar to each other and have a single
point of return that always puts the xid.

Signed-off-by: Matthew Wilcox <mawil...@microsoft.com>
Signed-off-by: Steve French <smfre...@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>

---
 fs/cifs/file.c |   26 ++++++++++++--------------
 1 file changed, 12 insertions(+), 14 deletions(-)

--- a/fs/cifs/file.c
+++ b/fs/cifs/file.c
@@ -3261,20 +3261,18 @@ static struct vm_operations_struct cifs_
 
 int cifs_file_strict_mmap(struct file *file, struct vm_area_struct *vma)
 {
-       int rc, xid;
+       int xid, rc = 0;
        struct inode *inode = file_inode(file);
 
        xid = get_xid();
 
-       if (!CIFS_CACHE_READ(CIFS_I(inode))) {
+       if (!CIFS_CACHE_READ(CIFS_I(inode)))
                rc = cifs_zap_mapping(inode);
-               if (rc)
-                       return rc;
-       }
-
-       rc = generic_file_mmap(file, vma);
-       if (rc == 0)
+       if (!rc)
+               rc = generic_file_mmap(file, vma);
+       if (!rc)
                vma->vm_ops = &cifs_file_vm_ops;
+
        free_xid(xid);
        return rc;
 }
@@ -3284,16 +3282,16 @@ int cifs_file_mmap(struct file *file, st
        int rc, xid;
 
        xid = get_xid();
+
        rc = cifs_revalidate_file(file);
-       if (rc) {
+       if (rc)
                cifs_dbg(FYI, "Validation prior to mmap failed, error=%d\n",
                         rc);
-               free_xid(xid);
-               return rc;
-       }
-       rc = generic_file_mmap(file, vma);
-       if (rc == 0)
+       if (!rc)
+               rc = generic_file_mmap(file, vma);
+       if (!rc)
                vma->vm_ops = &cifs_file_vm_ops;
+
        free_xid(xid);
        return rc;
 }