From 0b6291326d5e022c4fca80fa8f05eb2cdfa040cf Mon Sep 17 00:00:00 2001
From: Dirk Lemstra <dirk@lemstra.org>
Date: Fri, 29 Nov 2019 00:31:45 +0100
Subject: Added checks for empty input.

---
 Magick++/fuzz/encoder_fuzzer.cc | 5 ++++-
 Magick++/fuzz/main.cc           | 3 +++
 2 files changed, 7 insertions(+), 1 deletion(-)

(limited to 'Magick++')

diff --git a/Magick++/fuzz/encoder_fuzzer.cc b/Magick++/fuzz/encoder_fuzzer.cc
index 33dd5a927..b29d7722f 100644
--- a/Magick++/fuzz/encoder_fuzzer.cc
+++ b/Magick++/fuzz/encoder_fuzzer.cc
@@ -33,7 +33,10 @@ static ssize_t EncoderInitializer(const uint8_t *Data, const size_t Size, Magick
   return 0;
 }
 
-extern "C" int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) {
+extern "C" int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size)
+{
+  if (Size < 1)
+    return 0;
   Magick::Image image;
   const ssize_t offset = EncoderInitializer(Data, Size, image);
   if (offset < 0)
diff --git a/Magick++/fuzz/main.cc b/Magick++/fuzz/main.cc
index aa12b8395..2f1f5238f 100644
--- a/Magick++/fuzz/main.cc
+++ b/Magick++/fuzz/main.cc
@@ -30,6 +30,9 @@ public:
       return(false);
 
     size = file.tellg();
+    if (size < 1)
+      return(false);
+
     _size = size;
     _data = new char[_size];
     file.seekg(0, ios::beg);
-- 
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