cifs: Fix missing put_xid in cifs_file_strict_mmap

[ Upstream commit f04a703c3d613845ae3141bfaf223489de8ab3eb ]

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 <mawilcox@microsoft.com>
Signed-off-by: Steve French <smfrench@gmail.com>
CC: Stable <stable@vger.kernel.org>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>

diff --git a/fs/cifs/file.c b/fs/cifs/file.c
index 47e04038a846c1337f4b7de9e1924d98d3c1e96c..1366d2151389185c54fc8074a71dcc59ed4c1015 100644 (file)
--- a/fs/cifs/file.c
+++ b/fs/cifs/file.c
@@ -3231,20 +3231,18 @@ static struct vm_operations_struct cifs_file_vm_ops = {
 
 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;
 }
@@ -3254,16 +3252,16 @@ int cifs_file_mmap(struct file *file, struct vm_area_struct *vma)
        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;
 }