For simplicity, here's the patch that fixes this bug (and is included in
openssh 7.8):
diff --git a/openbsd-compat/port-net.c b/openbsd-compat/port-net.c
index 7050629c..bb535626 100644
--- a/openbsd-compat/port-net.c
+++ b/openbsd-compat/port-net.c
@@ -185,7 +185,7 @@ sys_tun_open(int tun, int mode, char **ifname)
else
debug("%s: %s mode %d fd %d", __func__, ifr.ifr_name, mode, fd);
- if (ifname != NULL && (*ifname = strdup(ifr.ifr_name)))
+ if (ifname != NULL && (*ifname = strdup(ifr.ifr_name)) == NULL)
goto failed;
return (fd);
@@ -272,7 +272,7 @@ sys_tun_open(int tun, int mode, char **ifname)
goto failed;
}
- if (ifname != NULL && (*ifname = strdup(ifr.ifr_name)))
+ if (ifname != NULL && (*ifname = strdup(ifr.ifr_name)) == NULL)
goto failed;
close(sock);
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https://bugs.launchpad.net/bugs/1801128
Title:
OpenSSH 7.7 -w tunnel bug
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