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Avoid crashing when Nsock connect calls the callback immediately due to parameter errors

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This commit is contained in:
dmiller 2016-03-04 23:04:01 +00:00
parent 374d0a1392
commit 0577e3bb1e
2 changed files with 21 additions and 4 deletions
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12
nse_nsock.cc
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@ -350,6 +350,15 @@ static void callback (nsock_pool nsp, nsock_event nse, void *ud)
{
nse_nsock_udata *nu = (nse_nsock_udata *) ud;
lua_State *L = nu->thread;
if (lua_status(L) == LUA_OK && nse_status(nse) == NSE_STATUS_ERROR) {
// Sometimes Nsock fails immediately and callback is called before
// l_connect has a chance to yield. TODO: Figure out how to return an error
// to the calling thread without falling into an infinite loop somewhere.
// http://seclists.org/nmap-dev/2016/q1/201
trace(nse_iod(nse), nu->action, nu->direction);
nsock_iod_delete(nu->nsiod, NSOCK_PENDING_NOTIFY);
luaL_error(L, "Nsock immediate error");
}
assert(lua_status(L) == LUA_YIELD);
trace(nse_iod(nse), nu->action, nu->direction);
status(L, nse_status(nse));
@ -515,6 +524,9 @@ static int l_connect (lua_State *L)
}
nu->af = dest->ai_addr->sa_family;
nu->thread = L;
nu->action = "PRECONNECT";
nu->direction = TO;
switch (what)
{