optimize: compare expression length

do not merge raw payload expressions with different length.

Other expression rely on key comparison which is assumed to have the
same length already.

Fixes: 60dcc01d6351 ("optimize: add __expr_cmp()")
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

1 files changed, 13 insertions, 0 deletions

diff --git a/tests/shell/testcases/optimizations/nomerge_raw_payload b/tests/shell/testcases/optimizations/nomerge_raw_payload
new file mode 100755
index 00000000..bb8678ac
--- /dev/null
+++ b/tests/shell/testcases/optimizations/nomerge_raw_payload
@@ -0,0 +1,13 @@
+#!/bin/bash
+
+set -e
+
+RULESET="table ip x {
+        chain y {
+                type filter hook prerouting priority raw; policy accept;
+                @th,160,32 0x02736c00 drop comment \"sl\"
+                @th,160,112 0x870697a7a6173656f03636f6d00 drop comment \"pizzaseo.com\"
+        }
+}"
+
+$NFT -o -f - <<< $RULESET