From 44628d45595313fc353eca824e96def165234356 Mon Sep 17 00:00:00 2001
From: Nick Wellnhofer <wellnhofer@aevum.de>
Date: Fri, 13 Dec 2024 15:23:30 +0100
Subject: [PATCH] fuzz: Harden leak check in lint fuzzer

Check for undetected memory leaks from previous iterations. This also
makes sure that the maxmem limit is checked deterministically.
---
 fuzz/lint.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/fuzz/lint.c b/fuzz/lint.c
index ca28d6f10..82de44b25 100644
--- a/fuzz/lint.c
+++ b/fuzz/lint.c
@@ -131,6 +131,11 @@ LLVMFuzzerTestOneInput(const char *data, size_t size) {
     unsigned uval;
     int ival;
 
+    if (xmlMemUsed() != 0) {
+        fprintf(stderr, "Undetected leak in previous iteration\n");
+        abort();
+    }
+
     vars.argv = malloc((numSwitches + 5 + 6 * 2) * sizeof(vars.argv[0]));
     vars.argi = 0;
     pushArg("xmllint"),