Prevent the ACISM backend from crashing when a scan is performed with no pattern.

2 files changed, 37 insertions, 0 deletions

diff --git a/src/analysis/scan/patterns/backends/acism.c b/src/analysis/scan/patterns/backends/acism.c
index eef681a..97f8561 100644
--- a/src/analysis/scan/patterns/backends/acism.c
+++ b/src/analysis/scan/patterns/backends/acism.c
@@ -1165,6 +1165,7 @@ static void g_acism_backend_run_scan(const GAcismBackend *backend, GScanContext
 #endif
 
     root = backend->states;
+    if (root == NULL) goto done;
 
     state = root;
 
@@ -1240,6 +1241,8 @@ static void g_acism_backend_run_scan(const GAcismBackend *backend, GScanContext
 
     }
 
+ done:
+
     g_object_unref(G_OBJECT(content));
 
 }
diff --git a/tests/analysis/scan/fuzzing.py b/tests/analysis/scan/fuzzing.py
new file mode 100644
index 0000000..64eeb33
--- /dev/null
+++ b/tests/analysis/scan/fuzzing.py
@@ -0,0 +1,34 @@
+
+from chrysacase import ChrysalideTestCase
+from pychrysalide.analysis.contents import MemoryContent
+from pychrysalide.analysis.scan import ContentScanner
+from pychrysalide.analysis.scan import ScanOptions
+from pychrysalide.analysis.scan.patterns.backends import AcismBackend
+from pychrysalide.analysis.scan.patterns.backends import BitapBackend
+
+
+class TestRostFuzzingFixes(ChrysalideTestCase):
+    """TestCases to remember all the fixes for crashes identified by fuzzing."""
+
+    def testEmptyPatternListWithContent(self):
+        """Check no backend is run if there is no pattern to look for."""
+
+        content = MemoryContent(b'\n')
+
+        rule = '''
+'''
+
+        backends = [
+            AcismBackend, # This one was segfaulting
+            BitapBackend,
+        ]
+
+        for b in backends:
+
+            options = ScanOptions()
+            options.backend_for_data = b
+
+            scanner = ContentScanner(rule)
+            ctx = scanner.analyze(options, content)
+
+            self.assertIsNotNone(ctx)