dfilter: Fix crash with nested function calls

When the jumps_ptr is NULL a nested function call
results in a NULL pointer dereference. We could add
a NULL check but removing the jump in commit e85f8d4cf19
was a mitake, because the jump is not always a no-op,
so add it back.

Fixes e85f8d4cf193721cd95daa15363054cd4d12a0f3.

1 files changed, 7 insertions, 0 deletions

diff --git a/test/suite_dfilter/group_function.py b/test/suite_dfilter/group_function.py
index a64f699636..aad95e604d 100644
--- a/test/suite_dfilter/group_function.py
+++ b/test/suite_dfilter/group_function.py
@@ -100,3 +100,10 @@ class TestFunctionLen:
     def test_function_len_5(self, checkDFilterCount):
         dfilter = '!len(http.host)'
         checkDFilterCount(dfilter, 0)
+
+class TestFunctionNested:
+    trace_file = 'http.pcap'
+
+    def test_function_nested_1(self, checkDFilterCount):
+        dfilter = 'abs(min(tcp.srcport, tcp.dstport)) == 80'
+        checkDFilterCount(dfilter, 1)