psql with GSS can crash

Hi all,

I got following stack:

fffffd7ffed14b70 strlen () + 40
fffffd7ffed71665 snprintf () + e5
fffffd7fff36d088 pg_GSS_startup () + 88
fffffd7fff36d43a pg_fe_sendauth () + 15a
fffffd7fff36e557 PQconnectPoll () + 3b7
fffffd7fff36e152 connectDBComplete () + a2
fffffd7fff36dc32 PQsetdbLogin () + 1b2
000000000041e96d main () + 30d
000000000041302c ???????? ()

It seems that connection is not fully configured and krbsrvname or
pghost is not filled. Following code in fe-auth.c pg_GSS_startup()
causes a crash:

440 maxlen = NI_MAXHOST + strlen(conn->krbsrvname) + 2;
441 temp_gbuf.value = (char *) malloc(maxlen);
442 snprintf(temp_gbuf.value, maxlen, "%s(at)%s",
443 conn->krbsrvname, conn->pghost);
444 temp_gbuf.length = strlen(temp_gbuf.value);

And following code in fe-connect.c fillPGconn() fill NULL value.

571 tmp = conninfo_getval(connOptions, "krbsrvname");
572 conn->krbsrvname = tmp ? strdup(tmp) : NULL;

I think that pg_GSS_startup should sanity the input.

Zdenek