cifs: dereferencing first then checking

This patch is based on Dan's original patch. His original description is
below:

Smatch complained about a couple checking for NULL after dereferencing
bugs.  I'm not super familiar with the code so I did the conservative
thing and move the dereferences after the checks.

The dereferences in cifs_lock() and cifs_fsync() were added in
ba00ba64cf0 "cifs: make various routines use the cifsFileInfo->tcon
pointer".  The dereference in find_writable_file() was added in
6508d904e6f "cifs: have find_readable/writable_file filter by fsuid".
The comments there say it's possible to trigger the NULL dereference
under stress.

Signed-off-by: Dan Carpenter <error27@gmail.com>
Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Steve French <sfrench@us.ibm.com>

1 files changed, 3 insertions, 7 deletions

diff --git a/fs/cifs/file.c b/fs/cifs/file.c
index 71185d1d310a..777e7f42b5b1 100644
--- a/fs/cifs/file.c
+++ b/fs/cifs/file.c
@@ -754,12 +754,6 @@ int cifs_lock(struct file *file, int cmd, struct file_lock *pfLock)
 
         cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
         tcon = tlink_tcon(((struct cifsFileInfo *)file->private_data)->tlink);
-
-        if (file->private_data == NULL) {
-                rc = -EBADF;
-                FreeXid(xid);
-                return rc;
-        }
         netfid = ((struct cifsFileInfo *)file->private_data)->netfid;
 
         if ((tcon->ses->capabilities & CAP_UNIX) &&
@@ -1154,7 +1148,7 @@ struct cifsFileInfo *find_writable_file(struct cifsInodeInfo *cifs_inode,
                                         bool fsuid_only)
 {
         struct cifsFileInfo *open_file;
-        struct cifs_sb_info *cifs_sb = CIFS_SB(cifs_inode->vfs_inode.i_sb);
+        struct cifs_sb_info *cifs_sb;
         bool any_available = false;
         int rc;
 
@@ -1168,6 +1162,8 @@ struct cifsFileInfo *find_writable_file(struct cifsInodeInfo *cifs_inode,
                 return NULL;
         }
 
+        cifs_sb = CIFS_SB(cifs_inode->vfs_inode.i_sb);
+
         /* only filter by fsuid on multiuser mounts */
         if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER))
                 fsuid_only = false;