Author: mav
Date: Thu Aug  2 23:15:10 2018
New Revision: 337194
URL: https://svnweb.freebsd.org/changeset/base/337194

Log:
  MFV r337193:
  9424 ztest failure: "unprotected error in call to Lua API (Invalid value type 
'f
  unction' for key 'error')"
  
  illumos/illumos-gate@fe3ba4d1227d8746116ece7240682b13595c3142
  
  Reviewed by: Sebastien Roy <[email protected]>
  Reviewed by: Paul Dagnelie <[email protected]>
  Reviewed by: Don Brady <[email protected]>
  Approved by: Robert Mustacchi <[email protected]>
  Author:     Matthew Ahrens <[email protected]>

Modified:
  head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zcp.c
Directory Properties:
  head/sys/cddl/contrib/opensolaris/   (props changed)

Modified: head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zcp.c
==============================================================================
--- head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zcp.c   Thu Aug  2 
23:13:40 2018        (r337193)
+++ head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zcp.c   Thu Aug  2 
23:15:10 2018        (r337194)
@@ -433,7 +433,7 @@ zcp_lua_to_nvlist_impl(lua_State *state, int index, nv
 /*
  * Convert a lua value to an nvpair, adding it to an nvlist with the given key.
  */
-void
+static void
 zcp_lua_to_nvlist(lua_State *state, int index, nvlist_t *nvl, const char *key)
 {
        /*
@@ -445,7 +445,7 @@ zcp_lua_to_nvlist(lua_State *state, int index, nvlist_
                (void) lua_error(state);
 }
 
-int
+static int
 zcp_lua_to_nvlist_helper(lua_State *state)
 {
        nvlist_t *nv = (nvlist_t *)lua_touserdata(state, 2);
@@ -454,11 +454,12 @@ zcp_lua_to_nvlist_helper(lua_State *state)
        return (0);
 }
 
-void
+static void
 zcp_convert_return_values(lua_State *state, nvlist_t *nvl,
     const char *key, zcp_eval_arg_t *evalargs)
 {
        int err;
+       VERIFY3U(1, ==, lua_gettop(state));
        lua_pushcfunction(state, zcp_lua_to_nvlist_helper);
        lua_pushlightuserdata(state, (char *)key);
        lua_pushlightuserdata(state, nvl);
@@ -904,6 +905,7 @@ zcp_eval_impl(dmu_tx_t *tx, boolean_t sync, zcp_eval_a
                            ZCP_RET_RETURN, evalargs);
                } else if (return_count > 1) {
                        evalargs->ea_result = SET_ERROR(ECHRNG);
+                       lua_settop(state, 0);
                        (void) lua_pushfstring(state, "Multiple return "
                            "values not supported");
                        zcp_convert_return_values(state, evalargs->ea_outnvl,
@@ -965,6 +967,7 @@ static void
 zcp_pool_error(zcp_eval_arg_t *evalargs, const char *poolname)
 {
        evalargs->ea_result = SET_ERROR(ECHRNG);
+       lua_settop(evalargs->ea_state, 0);
        (void) lua_pushfstring(evalargs->ea_state, "Could not open pool: %s",
            poolname);
        zcp_convert_return_values(evalargs->ea_state, evalargs->ea_outnvl,
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