cifs: Use file_dentry()

CIFS may be used as lower layer of overlayfs and accessing f_path.dentry can
lead to a crash.

Fix by replacing direct access of file->f_path.dentry with the
file_dentry() accessor, which will always return a native object.

Signed-off-by: Goldwyn Rodrigues <rgoldwyn@suse.com>
Acked-by: Shirish Pargaonkar <shirishpargaonkar@gmail.com>
Signed-off-by: Steve French <smfrench@gmail.com>

2 files changed, 4 insertions, 4 deletions

diff --git a/fs/cifs/file.c b/fs/cifs/file.c
index c03d0744648b..489ddc797105 100644
--- a/fs/cifs/file.c
+++ b/fs/cifs/file.c
@@ -271,7 +271,7 @@ struct cifsFileInfo *
 cifs_new_fileinfo(struct cifs_fid *fid, struct file *file,
                   struct tcon_link *tlink, __u32 oplock)
 {
-        struct dentry *dentry = file->f_path.dentry;
+        struct dentry *dentry = file_dentry(file);
         struct inode *inode = d_inode(dentry);
         struct cifsInodeInfo *cinode = CIFS_I(inode);
         struct cifsFileInfo *cfile;
@@ -461,7 +461,7 @@ int cifs_open(struct inode *inode, struct file *file)
         tcon = tlink_tcon(tlink);
         server = tcon->ses->server;
 
-        full_path = build_path_from_dentry(file->f_path.dentry);
+        full_path = build_path_from_dentry(file_dentry(file));
         if (full_path == NULL) {
                 rc = -ENOMEM;
                 goto out;
diff --git a/fs/cifs/readdir.c b/fs/cifs/readdir.c
index 867439c21001..65cf85dcda09 100644
--- a/fs/cifs/readdir.c
+++ b/fs/cifs/readdir.c
@@ -303,7 +303,7 @@ initiate_cifs_search(const unsigned int xid, struct file *file)
         cifsFile->invalidHandle = true;
         cifsFile->srch_inf.endOfSearch = false;
 
-        full_path = build_path_from_dentry(file->f_path.dentry);
+        full_path = build_path_from_dentry(file_dentry(file));
         if (full_path == NULL) {
                 rc = -ENOMEM;
                 goto error_exit;
@@ -762,7 +762,7 @@ static int cifs_filldir(char *find_entry, struct file *file,
                  */
                 fattr.cf_flags |= CIFS_FATTR_NEED_REVAL;
 
-        cifs_prime_dcache(file->f_path.dentry, &name, &fattr);
+        cifs_prime_dcache(file_dentry(file), &name, &fattr);
 
         ino = cifs_uniqueid_to_ino_t(fattr.cf_uniqueid);
         return !dir_emit(ctx, name.name, name.len, ino, fattr.cf_dtype);