intervals: fix crash when trying to remove element in empty set

The set deletion routine expects an initialized set, otherwise it crashes.

Fixes: 3e8d934e4f72 ("intervals: support to partial deletion with automerge")
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

1 files changed, 14 insertions, 0 deletions

diff --git a/tests/shell/testcases/sets/errors_0 b/tests/shell/testcases/sets/errors_0
new file mode 100755
index 00000000..2960b694
--- /dev/null
+++ b/tests/shell/testcases/sets/errors_0
@@ -0,0 +1,14 @@
+#!/bin/bash
+
+set -e
+
+RULESET="table ip x {
+	set y {
+		type ipv4_addr
+		flags interval
+	}
+}
+
+delete element ip x y { 2.3.4.5 }"
+
+$NFT -f - <<< $RULESET || exit 0