From 17602fefdeddaf7c26d451f7e3350c43ccb9a0e9 Mon Sep 17 00:00:00 2001
From: Douglas Bagnall <douglas.bagnall@catalyst.net.nz>
Date: Thu, 28 Jan 2021 17:33:22 +1300
Subject: [PATCH] fuzz:afl main: add a diagnostic message

LLVMFuzzerTestOneInput() NEVER returns non-zero, but if it does, we might as well
know what made it do so

Signed-off-by: Douglas Bagnall <douglas.bagnall@catalyst.net.nz>
Reviewed-by: Jeremy Allison <jra@samba.org>
---
 lib/fuzzing/afl-fuzz-main.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/lib/fuzzing/afl-fuzz-main.c b/lib/fuzzing/afl-fuzz-main.c
index e271ddb77c1..a7d97f0f670 100644
--- a/lib/fuzzing/afl-fuzz-main.c
+++ b/lib/fuzzing/afl-fuzz-main.c
@@ -38,6 +38,8 @@ int main(int argc, char *argv[]) {
 		ret = LLVMFuzzerTestOneInput(buf, size);
 		TALLOC_FREE(buf);
 		if (ret != 0) {
+			printf("LLVMFuzzerTestOneInput returned %d on argument %d\n",
+			       ret, i);
 			return ret;
 		}
 	}
-- 
2.47.3