A /0 subnet mask is theoretically valid, but ip route get doesn't allow
it:

$ ip route get 1.0.0.0/0
need at least a destination address

Remove the check so that it can go through:

$ ip/ip route get 1.0.0.0/0
1.0.0.0 via 192.168.1.1 dev eth0 src 192.168.1.91 uid 1000
    cache

Reported-by: Clément Hertling <wxc...@wxcafe.net>
Signed-off-by: Luca Boccassi <bl...@debian.org>
---
Stephen et al, this was reported by a Debian user:

https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=921737

It makes sense to me at a cursory glance, but sending as RFC as I'm
not 100% familiar with the route get function.

 ip/iproute.c | 5 -----
 1 file changed, 5 deletions(-)

diff --git a/ip/iproute.c b/ip/iproute.c
index 5f58a3b3..d78f43d8 100644
--- a/ip/iproute.c
+++ b/ip/iproute.c
@@ -2041,11 +2041,6 @@ static int iproute_get(int argc, char **argv)
                argc--; argv++;
        }
 
-       if (req.r.rtm_dst_len == 0) {
-               fprintf(stderr, "need at least a destination address\n");
-               return -1;
-       }
-
        if (idev || odev)  {
                int idx;
 
-- 
2.20.1

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