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bug: debug.sethook/gethook may overflow thread's stack

This commit is contained in:
Roberto Ierusalimschy 2008-01-21 11:37:08 -02:00
parent e7c989baf1
commit 74897bc52f
1 changed files with 10 additions and 12 deletions
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22
ldblib.c
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@ -1,5 +1,5 @@
/* /*
** $Id: ldblib.c,v 1.107 2007/06/22 15:33:54 roberto Exp roberto $ ** $Id: ldblib.c,v 1.108 2008/01/18 17:14:47 roberto Exp roberto $
** Interface from Lua to its debug API ** Interface from Lua to its debug API
** See Copyright Notice in lua.h ** See Copyright Notice in lua.h
*/ */
@ -268,13 +268,12 @@ static int db_sethook (lua_State *L) {
count = luaL_optint(L, arg+3, 0); count = luaL_optint(L, arg+3, 0);
func = hookf; mask = makemask(smask, count); func = hookf; mask = makemask(smask, count);
} }
gethooktable(L1); gethooktable(L);
lua_pushlightuserdata(L1, L1); lua_pushlightuserdata(L, L1);
lua_pushvalue(L, arg+1); lua_pushvalue(L, arg+1);
lua_xmove(L, L1, 1); lua_rawset(L, -3); /* set new hook */
lua_rawset(L1, -3); /* set new hook */ lua_pop(L, 1); /* remove hook table */
lua_pop(L1, 1); /* remove hook table */ lua_sethook(L1, func, mask, count); /* set hooks */
lua_sethook(L1, func, mask, count);
return 0; return 0;
} }
@ -288,11 +287,10 @@ static int db_gethook (lua_State *L) {
if (hook != NULL && hook != hookf) /* external hook? */ if (hook != NULL && hook != hookf) /* external hook? */
lua_pushliteral(L, "external hook"); lua_pushliteral(L, "external hook");
else { else {
gethooktable(L1); gethooktable(L);
lua_pushlightuserdata(L1, L1); lua_pushlightuserdata(L, L1);
lua_rawget(L1, -2); /* get hook */ lua_rawget(L, -2); /* get hook */
lua_remove(L1, -2); /* remove hook table */ lua_remove(L, -2); /* remove hook table */
lua_xmove(L1, L, 1);
} }
lua_pushstring(L, unmakemask(mask, buff)); lua_pushstring(L, unmakemask(mask, buff));
lua_pushinteger(L, lua_gethookcount(L1)); lua_pushinteger(L, lua_gethookcount(L1));