[CIFS] Allow null nd (as nfs server uses) on create

While creating a file on a server which supports unix extensions
such as Samba, if a file is being created which does not supply
nameidata (i.e. nd is null), cifs client can oops when calling
cifs_posix_open.

Signed-off-by: Shirish Pargaonkar <shirishp@us.ibm.com>
Signed-off-by: Steve French <sfrench@us.ibm.com>

1 files changed, 7 insertions, 4 deletions

diff --git a/fs/cifs/file.c b/fs/cifs/file.c
index 2ba4c41be972..5f1f7682256b 100644
--- a/fs/cifs/file.c
+++ b/fs/cifs/file.c
@@ -298,10 +298,12 @@ int cifs_open(struct inode *inode, struct file *file)
             (CIFS_UNIX_POSIX_PATH_OPS_CAP &
                         le64_to_cpu(tcon->fsUnixInfo.Capability))) {
                 int oflags = (int) cifs_posix_convert_flags(file->f_flags);
+                oflags |= SMB_O_CREAT;
                 /* can not refresh inode info since size could be stale */
                 rc = cifs_posix_open(full_path, &inode, file->f_path.mnt,
-                                     cifs_sb->mnt_file_mode /* ignored */,
-                                     oflags, &oplock, &netfid, xid);
+                                inode->i_sb,
+                                cifs_sb->mnt_file_mode /* ignored */,
+                                oflags, &oplock, &netfid, xid);
                 if (rc == 0) {
                         cFYI(1, "posix open succeeded");
                         /* no need for special case handling of setting mode
@@ -513,8 +515,9 @@ reopen_error_exit:
                 int oflags = (int) cifs_posix_convert_flags(file->f_flags);
                 /* can not refresh inode info since size could be stale */
                 rc = cifs_posix_open(full_path, NULL, file->f_path.mnt,
-                                     cifs_sb->mnt_file_mode /* ignored */,
-                                     oflags, &oplock, &netfid, xid);
+                                inode->i_sb,
+                                cifs_sb->mnt_file_mode /* ignored */,
+                                oflags, &oplock, &netfid, xid);
                 if (rc == 0) {
                         cFYI(1, "posix reopen succeeded");
                         goto reopen_success;