diff --git a/vendor.sh b/vendor.sh
index 21cd2af..5c99138 100755
--- a/vendor.sh
+++ b/vendor.sh
@@ -1,7 +1,7 @@
 #!/bin/bash
 set -eux -o pipefail
-# Aug 26, 2019
-LIBSLIRP_COMMIT=d203c81bc6c861e1671122c3194c21d1a6763641
+# Nov 21, 2019
+LIBSLIRP_COMMIT=d171af3732a0610a25334b06b77fa547bd677918
 LIBSLIRP_REPO=https://gitlab.freedesktop.org/slirp/libslirp.git
 
 # Jul 12, 2019
diff --git a/vendor/README.md b/vendor/README.md
index 8036fe2..2ac63d6 100644
--- a/vendor/README.md
+++ b/vendor/README.md
@@ -1,7 +1,7 @@
 # DO NOT EDIT MANUALLY
 
 Vendored components:
-* libslirp: https://gitlab.freedesktop.org/slirp/libslirp.git (`d203c81bc6c861e1671122c3194c21d1a6763641`)
+* libslirp: https://gitlab.freedesktop.org/slirp/libslirp.git (`d171af3732a0610a25334b06b77fa547bd677918`)
 * parson: https://github.com/kgabis/parson.git (`c5bb9557fe98367aa8e041c65863909f12ee76b2`)
 
 Please do not edit the contents under this directory manually.
diff --git a/vendor/libslirp/src/misc.c b/vendor/libslirp/src/misc.c
index 6675acc..560d5f1 100644
--- a/vendor/libslirp/src/misc.c
+++ b/vendor/libslirp/src/misc.c
@@ -168,7 +168,8 @@ g_spawn_async_with_fds_slirp(const gchar *working_directory, gchar **argv,
 int fork_exec(struct socket *so, const char *ex)
 {
     GError *err = NULL;
-    char **argv;
+    gint argc = 0;
+    gchar **argv = NULL;
     int opt, sp[2];
 
     DEBUG_CALL("fork_exec");
@@ -179,7 +180,12 @@ int fork_exec(struct socket *so, const char *ex)
         return 0;
     }
 
-    argv = g_strsplit(ex, " ", -1);
+    if (!g_shell_parse_argv(ex, &argc, &argv, &err)) {
+        g_critical("fork_exec invalid command: %s\nerror: %s", ex, err->message);
+        g_error_free(err);
+        return 0;
+    }
+
     g_spawn_async_with_fds(NULL /* cwd */, argv, NULL /* env */,
                            G_SPAWN_SEARCH_PATH, fork_exec_child_setup,
                            NULL /* data */, NULL /* child_pid */, sp[1], sp[1],
diff --git a/vendor/libslirp/src/sbuf.c b/vendor/libslirp/src/sbuf.c
index abced48..0569c34 100644
--- a/vendor/libslirp/src/sbuf.c
+++ b/vendor/libslirp/src/sbuf.c
@@ -39,13 +39,16 @@ void sbreserve(struct sbuf *sb, int size)
     if (sb->sb_data) {
         /* Already alloced, realloc if necessary */
         if (sb->sb_datalen != size) {
-            sb->sb_wptr = sb->sb_rptr = sb->sb_data =
-                (char *)realloc(sb->sb_data, size);
+            char *new = realloc(sb->sb_data, size);
             sb->sb_cc = 0;
-            if (sb->sb_wptr)
+            if (new) {
+                sb->sb_data = sb->sb_wptr = sb->sb_rptr = new;
                 sb->sb_datalen = size;
-            else
+            } else {
+                free(sb->sb_data);
+                sb->sb_data = sb->sb_wptr = sb->sb_rptr = NULL;
                 sb->sb_datalen = 0;
+            }
         }
     } else {
         sb->sb_wptr = sb->sb_rptr = sb->sb_data = (char *)malloc(size);
diff --git a/vendor/libslirp/src/socket.c b/vendor/libslirp/src/socket.c
index d96d8c4..2f20028 100644
--- a/vendor/libslirp/src/socket.c
+++ b/vendor/libslirp/src/socket.c
@@ -195,7 +195,9 @@ int soread(struct socket *so)
 
             err = errno;
             if (nn == 0) {
-                if (getpeername(so->s, paddr, &alen) < 0) {
+                int shutdown_wr = so->so_state & SS_FCANTSENDMORE;
+
+                if (!shutdown_wr && getpeername(so->s, paddr, &alen) < 0) {
                     err = errno;
                 } else {
                     getsockopt(so->s, SOL_SOCKET, SO_ERROR, &err, &elen);