X-Git-Url: http://drtracing.org/?a=blobdiff_plain;f=fs%2Fxattr.c;h=c243905835abd25b52eb8daf061b5f11b3a5708e;hb=3fbff9c874072a085c08af706beb88e7797d78b4;hp=4beafc43daa58bff015f0839c78b5a65f8b8d2ab;hpb=89a82a9218fabd753979847f494565f1fa91d7a8;p=deliverable%2Flinux.git

diff --git a/fs/xattr.c b/fs/xattr.c
index 4beafc43daa5..c243905835ab 100644
--- a/fs/xattr.c
+++ b/fs/xattr.c
@@ -38,6 +38,13 @@ xattr_permission(struct inode *inode, const char *name, int mask)
 	if (mask & MAY_WRITE) {
 		if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
 			return -EPERM;
+		/*
+		 * Updating an xattr will likely cause i_uid and i_gid
+		 * to be writen back improperly if their true value is
+		 * unknown to the vfs.
+		 */
+		if (HAS_UNMAPPED_ID(inode))
+			return -EPERM;
 	}
 
 	/*