From f98a9b755940edbf2a71830680499a876d9d250d Mon Sep 17 00:00:00 2001
From: pancake <pancake@nopcode.org>
Date: Wed, 12 Jun 2024 13:37:43 +0200
Subject: [PATCH] Fix null deref in dbtj ##crash

---
 binr/r2r/run.c            | 1 +
 libr/core/cmd_debug.inc.c | 8 +++++---
 test/db/json/json4        | 2 +-
 3 files changed, 7 insertions(+), 4 deletions(-)

diff --git a/binr/r2r/run.c b/binr/r2r/run.c
index c840f63fa9c5e..104d183718f1d 100644
--- a/binr/r2r/run.c
+++ b/binr/r2r/run.c
@@ -1403,6 +1403,7 @@ R_API R2RTestResultInfo *r2r_run_test(R2RRunConfig *config, R2RTest *test) {
 			R2RJsonTest *json_test = test->json_test;
 			R2RProcessOutput *out = r2r_run_json_test (config, json_test, subprocess_runner, NULL);
 			success = r2r_check_json_test (out, json_test);
+#define TEST_JSON_WITH_NO_FILES 0
 #if TEST_JSON_WITH_NO_FILES
 // R2_590 - enable these tests
 			if (strchr (json_test->cmd, '@')) {
diff --git a/libr/core/cmd_debug.inc.c b/libr/core/cmd_debug.inc.c
index c99ab168364cd..c7bfba0074a33 100644
--- a/libr/core/cmd_debug.inc.c
+++ b/libr/core/cmd_debug.inc.c
@@ -3435,9 +3435,11 @@ static void get_backtrace_info(RCore* core, RDebugFrame* frame, ut64 addr, char*
 			*flagdesc2 = r_str_newf ("%s", f->name);
 		}
 	}
-	if (!strcmp (*flagdesc, *flagdesc2)) {
-		free (*flagdesc2);
-		*flagdesc2 = NULL;
+	if (*flagdesc && *flagdesc2) {
+		if (!strcmp (*flagdesc, *flagdesc2)) {
+			free (*flagdesc2);
+			*flagdesc2 = NULL;
+		}
 	}
 	if (pcstr && spstr) {
 		if (core->dbg->bits & R_SYS_BITS_64) {
diff --git a/test/db/json/json4 b/test/db/json/json4
index c57b7da389fe1..dac093b003cfb 100644
--- a/test/db/json/json4
+++ b/test/db/json/json4
@@ -1,5 +1,5 @@
 rabin2 -gj /bin/ls
-r2 -jV
+# r2 -jV
 pcj
 # pdbj
 # pdfj