From: Evgeny Vereshchagin <evvers@ya.ru>
Date: Sat, 30 Oct 2021 18:09:30 +0000 (+0000)
Subject: mount_fuzz: reject giant files early
X-Git-Tag: v2.38-rc1~195^2
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=58c3bc12a54c9d78fe0999036a3cca70bdda1d6e;p=thirdparty%2Futil-linux.git

mount_fuzz: reject giant files early

It should help to address https://github.com/google/oss-fuzz/issues/6703

Signed-off-by: Evgeny Vereshchagin <evvers@ya.ru>
---

diff --git a/libmount/src/fuzz.c b/libmount/src/fuzz.c
index e845016a0a..2c84714430 100644
--- a/libmount/src/fuzz.c
+++ b/libmount/src/fuzz.c
@@ -13,6 +13,10 @@ int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
         if (size == 0)
                 return 0;
 
+        // 128Kb should be enough to trigger all the issues we're interested in
+        if (size > 131072)
+                return 0;
+
         tb = mnt_new_table();
         if (!tb)
 		err_oom();