debug.sethook/gethook may overflow the thread's stack

This commit is contained in:
Roberto Ierusalimschy 2008-01-21 12:41:19 -02:00
parent 74897bc52f
commit 3a515df086
1 changed files with 46 additions and 0 deletions

46
bugs
View File

@ -1636,6 +1636,52 @@ lua.c:
]],
}
Bug{
what = [[debug.sethook/gethook may overflow the thread's stack]],
report = [[Ivko Stanilov, on 2008/01/04]],
since = [[5.1]],
example = [[
a = coroutine.create(function() yield() end)
coroutine.resume(a)
debug.sethook(a) -- may overflow the stack of 'a'
]],
patch = [[ ]],
ldblib.c:
@@ -268,12 +268,11 @@
count = luaL_optint(L, arg+3, 0);
func = hookf; mask = makemask(smask, count);
}
- gethooktable(L1);
- lua_pushlightuserdata(L1, L1);
+ gethooktable(L);
+ lua_pushlightuserdata(L, L1);
lua_pushvalue(L, arg+1);
- lua_xmove(L, L1, 1);
- lua_rawset(L1, -3); /* set new hook */
- lua_pop(L1, 1); /* remove hook table */
+ lua_rawset(L, -3); /* set new hook */
+ lua_pop(L, 1); /* remove hook table */
lua_sethook(L1, func, mask, count); /* set hooks */
return 0;
}
@@ -288,11 +287,10 @@
if (hook != NULL && hook != hookf) /* external hook? */
lua_pushliteral(L, "external hook");
else {
- gethooktable(L1);
- lua_pushlightuserdata(L1, L1);
- lua_rawget(L1, -2); /* get hook */
- lua_remove(L1, -2); /* remove hook table */
- lua_xmove(L1, L, 1);
+ gethooktable(L);
+ lua_pushlightuserdata(L, L1);
+ lua_rawget(L, -2); /* get hook */
+ lua_remove(L, -2); /* remove hook table */
}
lua_pushstring(L, unmakemask(mask, buff));
lua_pushinteger(L, lua_gethookcount(L1));
}
Bug{
what = [[ ]],
report = [[ , on ]],