1 files changed, 15 insertions, 3 deletions

diff --git a/fs/cifs/inode.c b/fs/cifs/inode.c
index d952914dfc4c..6d911896d74c 100644
--- a/fs/cifs/inode.c
+++ b/fs/cifs/inode.c
@@ -985,7 +985,12 @@ mkdir_get_info:
                   * failed to get it from the server or was set bogus */
                 if ((direntry->d_inode) && (direntry->d_inode->i_nlink < 2))
                                 direntry->d_inode->i_nlink = 2;
+
                 mode &= ~current->fs->umask;
+                /* must turn on setgid bit if parent dir has it */
+                if (inode->i_mode & S_ISGID)
+                        mode |= S_ISGID;
+
                 if (pTcon->unix_ext) {
                         struct cifs_unix_set_info_args args = {
                                 .mode   = mode,
@@ -996,7 +1001,10 @@ mkdir_get_info:
                         };
                         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
                                 args.uid = (__u64)current->fsuid;
-                                args.gid = (__u64)current->fsgid;
+                                if (inode->i_mode & S_ISGID)
+                                        args.gid = (__u64)inode->i_gid;
+                                else
+                                        args.gid = (__u64)current->fsgid;
                         } else {
                                 args.uid = NO_CHANGE_64;
                                 args.gid = NO_CHANGE_64;
@@ -1026,8 +1034,12 @@ mkdir_get_info:
                                      CIFS_MOUNT_SET_UID) {
                                         direntry->d_inode->i_uid =
                                                 current->fsuid;
-                                        direntry->d_inode->i_gid =
-                                                current->fsgid;
+                                        if (inode->i_mode & S_ISGID)
+                                                direntry->d_inode->i_gid =
+                                                        inode->i_gid;
+                                        else
+                                                direntry->d_inode->i_gid =
+                                                        current->fsgid;
                                 }
                         }
                 }