parser: reject zero-length interface names

device "" results in an assertion during evaluation.
Before:
nft: expression.c:426: constant_expr_alloc: Assertion `(((len) + (8) - 1) / (8)) > 0' failed.
After:
zero_length_devicename_assert:3:42-49: Error: you cannot set an empty interface name
type filter hook ingress device""lo" priority -1
                         ^^^^^^^^
Signed-off-by: Florian Westphal <fw@strlen.de>

1 files changed, 5 insertions, 0 deletions

diff --git a/tests/shell/testcases/bogons/nft-f/zero_length_devicename_assert b/tests/shell/testcases/bogons/nft-f/zero_length_devicename_assert
new file mode 100644
index 00000000..84f33073
--- /dev/null
+++ b/tests/shell/testcases/bogons/nft-f/zero_length_devicename_assert
@@ -0,0 +1,5 @@
+table ip x {
+        chain Main_Ingress1 {
+                type filter hook ingress device""lo" priority -1
+	}
+}