Merge pull request #1222 from m-holger/fuzz2

In PL_DCT add option to limit the size of uncompressed corrupt data

CMakeLists.txt

@@ -7,7 +7,7 @@ cmake_minimum_required(VERSION 3.16)
 # also find the version number here. generate_auto_job also reads the
 # version from here.
 project(qpdf
-  VERSION 11.9.2
+  VERSION 11.10.0
   LANGUAGES C CXX)
 
 # Enable correct rpath handling for MacOSX

fuzz/dct_fuzzer.cc

@@ -27,7 +27,7 @@ void
 FuzzHelper::doChecks()
 {
     Pl_Discard discard;
-    Pl_DCT p("decode", &discard);
+    Pl_DCT p("decode", &discard, 20'000'000);
     p.write(const_cast<unsigned char*>(data), size);
     p.finish();
 }

include/qpdf/DLL.h

@@ -25,13 +25,13 @@
 
 /* The first version of qpdf to include the version constants is 10.6.0. */
 #define QPDF_MAJOR_VERSION 11
-#define QPDF_MINOR_VERSION 9
-#define QPDF_PATCH_VERSION 2
+#define QPDF_MINOR_VERSION 10
+#define QPDF_PATCH_VERSION 0
 
 #ifdef QPDF_FUTURE
-# define QPDF_VERSION "11.9.2+future"
+# define QPDF_VERSION "11.10.0+future"
 #else
-# define QPDF_VERSION "11.9.2"
+# define QPDF_VERSION "11.10.0"
 #endif
 
 /*

include/qpdf/Pl_DCT.hh

@@ -34,6 +34,11 @@ class QPDF_DLL_CLASS Pl_DCT: public Pipeline
     QPDF_DLL
     Pl_DCT(char const* identifier, Pipeline* next);
 
+    // Constructor for decompressing image data. If corrupt_data_limit is non-zero and the data is
+    // corrupt, only attempt to uncompress if the uncompressed size is less than corrupt_data_limit.
+    QPDF_DLL
+    Pl_DCT(char const* identifier, Pipeline* next, size_t corrupt_data_limit);
+
     class QPDF_DLL_CLASS CompressConfig
     {
       public:
@@ -80,26 +85,30 @@ class QPDF_DLL_CLASS Pl_DCT: public Pipeline
         ~Members() = default;
 
       private:
+        // For compression
         Members(
-            action_e action,
-            char const* buf_description,
-            JDIMENSION image_width = 0,
-            JDIMENSION image_height = 0,
-            int components = 1,
-            J_COLOR_SPACE color_space = JCS_GRAYSCALE,
-            CompressConfig* config_callback = nullptr);
+            JDIMENSION image_width,
+            JDIMENSION image_height,
+            int components,
+            J_COLOR_SPACE color_space,
+            CompressConfig* config_callback);
+        // For decompression
+        Members(size_t corrupt_data_limit);
         Members(Members const&) = delete;
 
         action_e action;
         Pl_Buffer buf;
 
-        // Used for compression
-        JDIMENSION image_width;
-        JDIMENSION image_height;
-        int components;
-        J_COLOR_SPACE color_space;
+        // Used for decompression
+        size_t corrupt_data_limit{0};
 
-        CompressConfig* config_callback;
+        // Used for compression
+        JDIMENSION image_width{0};
+        JDIMENSION image_height{0};
+        int components{1};
+        J_COLOR_SPACE color_space{JCS_GRAYSCALE};
+
+        CompressConfig* config_callback{nullptr};
     };
 
     std::shared_ptr<Members> m;

job.sums

@@ -1,5 +1,5 @@
 # Generated by generate_auto_job
-CMakeLists.txt 085e7290a43f2cc0cbac31aeab0a571731f4c26be25a243c458d93881ef8fc3d
+CMakeLists.txt 47752f33b17fa526d46fc608a25ad6b8c61feba9deb1bd659fddf93e6e08b102
 generate_auto_job f64733b79dcee5a0e3e8ccc6976448e8ddf0e8b6529987a66a7d3ab2ebc10a86
 include/qpdf/auto_job_c_att.hh 4c2b171ea00531db54720bf49a43f8b34481586ae7fb6cbf225099ee42bc5bb4
 include/qpdf/auto_job_c_copy_att.hh 50609012bff14fd82f0649185940d617d05d530cdc522185c7f3920a561ccb42
@@ -16,5 +16,5 @@ libqpdf/qpdf/auto_job_json_init.hh a87256c082427ec0318223762472970b2eced535c0c8b
 libqpdf/qpdf/auto_job_schema.hh 5dac568dff39614e161a0af59a0f328f1e28edf69b96f08bb76fd592d51bb053
 manual/_ext/qpdf.py 6add6321666031d55ed4aedf7c00e5662bba856dfcd66ccb526563bffefbb580
 manual/cli.rst 94057baba9ecffb4ce19ae61c8fa507ef07209c280fccae97b283c3dfce834e0
-manual/qpdf.1 f39379c4921f4c22ba4a2ab28dcda8b1898347b149032de603fd423cbde56fe4
+manual/qpdf.1 0ec05f1392c160165cdf6adada4de84c0de75bd2fb5762caff4e1372aacada4c
 manual/qpdf.1.in 436ecc85d45c4c9e2dbd1725fb7f0177fb627179469f114561adf3cb6cbb677b

libqpdf/Pl_DCT.cc

@@ -1,5 +1,6 @@
 #include <qpdf/Pl_DCT.hh>
 
+#include "qpdf/QPDFLogger.hh"
 #include <qpdf/QIntC.hh>
 #include <qpdf/QTC.hh>
 
@@ -31,16 +32,21 @@ error_handler(j_common_ptr cinfo)
     longjmp(jerr->jmpbuf, 1);
 }
 
+Pl_DCT::Members::Members(size_t corrupt_data_limit) :
+    action(a_decompress),
+    buf("DCT compressed image"),
+    corrupt_data_limit(corrupt_data_limit)
+{
+}
+
 Pl_DCT::Members::Members(
-    action_e action,
-    char const* buf_description,
     JDIMENSION image_width,
     JDIMENSION image_height,
     int components,
     J_COLOR_SPACE color_space,
     CompressConfig* config_callback) :
-    action(action),
-    buf(buf_description),
+    action(a_compress),
+    buf("DCT uncompressed image"),
     image_width(image_width),
     image_height(image_height),
     components(components),
@@ -50,8 +56,13 @@ Pl_DCT::Members::Members(
 }
 
 Pl_DCT::Pl_DCT(char const* identifier, Pipeline* next) :
+    Pl_DCT(identifier, next, 0)
+{
+}
+
+Pl_DCT::Pl_DCT(char const* identifier, Pipeline* next, size_t corrupt_data_limit) :
     Pipeline(identifier, next),
-    m(new Members(a_decompress, "DCT compressed image"))
+    m(new Members(corrupt_data_limit))
 {
 }
 
@@ -64,14 +75,7 @@ Pl_DCT::Pl_DCT(
     J_COLOR_SPACE color_space,
     CompressConfig* config_callback) :
     Pipeline(identifier, next),
-    m(new Members(
-        a_compress,
-        "DCT uncompressed image",
-        image_width,
-        image_height,
-        components,
-        color_space,
-        config_callback))
+    m(new Members(image_width, image_height, components, color_space, config_callback))
 {
 }
 
@@ -311,16 +315,22 @@ Pl_DCT::decompress(void* cinfo_p, Buffer* b)
 
     (void)jpeg_read_header(cinfo, TRUE);
     (void)jpeg_calc_output_dimensions(cinfo);
-
     unsigned int width = cinfo->output_width * QIntC::to_uint(cinfo->output_components);
-    JSAMPARRAY buffer =
-        (*cinfo->mem->alloc_sarray)(reinterpret_cast<j_common_ptr>(cinfo), JPOOL_IMAGE, width, 1);
+    if (cinfo->err->num_warnings == 0 || m->corrupt_data_limit == 0 ||
+        (width * QIntC::to_uint(cinfo->output_height)) < m->corrupt_data_limit) {
+        // err->num_warnings is the number of corrupt data warnings emitted.
+        // err->msg_code could also be the code of an informational message.
+        JSAMPARRAY buffer = (*cinfo->mem->alloc_sarray)(
+            reinterpret_cast<j_common_ptr>(cinfo), JPOOL_IMAGE, width, 1);
 
         (void)jpeg_start_decompress(cinfo);
         while (cinfo->output_scanline < cinfo->output_height) {
             (void)jpeg_read_scanlines(cinfo, buffer, 1);
-        this->getNext()->write(buffer[0], width * sizeof(buffer[0][0]));
+            getNext()->write(buffer[0], width * sizeof(buffer[0][0]));
         }
         (void)jpeg_finish_decompress(cinfo);
-    this->getNext()->finish();
+    } else {
+        *QPDFLogger::defaultLogger()->getError() << "corrupt JPEG data ignored" << "\n";
+    }
+    getNext()->finish();
 }

manual/qpdf.1

@@ -3,7 +3,7 @@
 .\" Edits will be automatically overwritten if the build is
 .\" run in maintainer mode.
 .\"
-.TH QPDF "1" "" "qpdf version 11.9.2" "User Commands"
+.TH QPDF "1" "" "qpdf version 11.10.0" "User Commands"
 .SH NAME
 qpdf \- PDF transformation software
 .SH SYNOPSIS