segfault, smp_fetch_ssl_hello_sni - bleft = chn->buf->i;, one more bugreport

[Denys Fedoryshchenko]

Hi

It seems after adding rules:
       acl youtubedst dst 173.194.40.0/24 173.194.41.0/24
       acl youtube req_ssl_sni -m end googlevideos.com googlevideo.com 
gvt1.com youtube.com
       tcp-request connection reject if youtube
       tcp-request connection reject if youtubedst

To frontend, i experienced segfault. gdb details follows:

#0  smp_fetch_ssl_hello_sni (px=0x6eae90, s=0x707c30, l7=0x0, 
opt=<optimized out>, args=0x6aae40 <empty_arg_list>, smp=0x7fffb5515a50, 
kw=0x48cef7 "req.ssl_sni") at src/payload.c:279
279             bleft = chn->buf->i;
(gdb) print chn->buf
Cannot access memory at address 0x8
(gdb) print chn
$1 = (struct channel *) 0x0
(gdb)

Adding
chn = ((opt & SMP_OPT_DIR) == SMP_OPT_DIR_RES) ? s->rep : s->req;

+if (!chn)
+    return 0;

Helped for me.