cifs: Override unmappable incoming uids and gids

The cifs protocol has a 64bit space for uids and gids, while linux
only supports a 32bit space today.  Instead of silently truncating
64bit cifs ids, replace cifs ids that do not fit in the 32bit linux
id space with the default uid and gids for the cifs mount.

Cc: Steve French <smfrench@gmail.com>
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>

diff --git a/fs/cifs/inode.c b/fs/cifs/inode.c
index ed6208ff85a770771841a0fe54da82dff26bdfa3..d7ea2a6eaead910595f3c7b8e3252b21a34398d2 100644 (file)
--- a/fs/cifs/inode.c
+++ b/fs/cifs/inode.c
@@ -244,15 +244,19 @@ cifs_unix_basic_to_fattr(struct cifs_fattr *fattr, FILE_UNIX_BASIC_INFO *info,
                break;
        }
 
-       if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID)
-               fattr->cf_uid = cifs_sb->mnt_uid;
-       else
-               fattr->cf_uid = le64_to_cpu(info->Uid);
-
-       if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID)
-               fattr->cf_gid = cifs_sb->mnt_gid;
-       else
-               fattr->cf_gid = le64_to_cpu(info->Gid);
+       fattr->cf_uid = cifs_sb->mnt_uid;
+       if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID)) {
+               u64 id = le64_to_cpu(info->Uid);
+               if (id < ((uid_t)-1))
+                       fattr->cf_uid = id;
+       }
+       
+       fattr->cf_gid = cifs_sb->mnt_gid;
+       if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID)) {
+               u64 id = le64_to_cpu(info->Gid);
+               if (id < ((gid_t)-1))
+                       fattr->cf_gid = id;
+       }
 
        fattr->cf_nlink = le64_to_cpu(info->Nlinks);
 }