Suppress excessive warnings while fuzzing

Add extra fuzz test case and amend memory limit for Pl_DCT.

Suppress excessive warnings while fuzzing
Add extra fuzz test case and amend memory limit for Pl_DCT.
m-holger
1 parent 9081ac69
Showing 6 changed files with 13 additions and 5 deletions
fuzz/CMakeLists.txt
fuzz/qpdf_extra/69977.fuzz
fuzz/qpdf_fuzzer.cc
fuzz/qtest/fuzz.test
libqpdf/Pl_DCT.cc
libqpdf/QPDF.cc
@@ -121,6 +121,7 @@ set(CORPUS_OTHER
   69857.fuzz
   69913.fuzz
   69969.fuzz
+  69977.fuzz
 )
  
 set(CORPUS_DIR ${CMAKE_CURRENT_BINARY_DIR}/qpdf_corpus)
@@ -173,11 +173,11 @@ FuzzHelper::doChecks()
 {
     // Get as much coverage as possible in parts of the library that
     // might benefit from fuzzing.
-    std::cout << "starting testWrite\n";
+    std::cerr << "\ninfo: starting testWrite\n";
     testWrite();
-    std::cout << "\nstarting testPages\n\n";
+    std::cerr << "\ninfo: starting testPages\n";
     testPages();
-    std::cout << "\nstarting testOutlines\n\n";
+    std::cerr << "\ninfo: starting testOutlines\n";
     testOutlines();
 }
  
@@ -21,7 +21,7 @@ my @fuzzers = (
     ['pngpredictor' => 1],
     ['runlength' => 6],
     ['tiffpredictor' => 2],
-    ['qpdf' => 63],             # increment when adding new files
+    ['qpdf' => 64],             # increment when adding new files
     );
  
 my $n_tests = 0;
@@ -320,7 +320,7 @@ Pl_DCT::decompress(void* cinfo_p, Buffer* b)
     cinfo->mem->max_memory_to_use = 1'000'000'000;
     // For some corrupt files the memory used internally by libjpeg stays within the above limits
     // even though the size written to the next pipeline is significantly larger.
-    m->corrupt_data_limit = 100'000'000;
+    m->corrupt_data_limit = 10'000'000;
 #endif
     jpeg_buffer_src(cinfo, b);
  
@@ -494,6 +494,13 @@ QPDF::warn(QPDFExc const&amp; e)
 {
     m->warnings.push_back(e);
     if (!m->suppress_warnings) {
+#ifdef QPDF_OSS_FUZZ
+        if (m->warnings.size() > 20) {
+            *m->log->getWarn() << "WARNING: too many warnings - additional warnings surpressed\n";
+            m->suppress_warnings = true;
+            return;
+        }
+#endif
         *m->log->getWarn() << "WARNING: " << m->warnings.back().what() << "\n";
     }
 }