Bug Summary

File:libs/threadimageio/thumb/thumbnailcreator_basic.cpp
Warning:line 176, column 15
Value of 'errno' was not checked and may be overwritten by function 'png_create_read_struct'

Annotated Source Code

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clang -cc1 -cc1 -triple x86_64-pc-linux-gnu -analyze -disable-free -clear-ast-before-backend -disable-llvm-verifier -discard-value-names -main-file-name thumbnailcreator_basic.cpp -analyzer-checker=core -analyzer-checker=apiModeling -analyzer-checker=unix -analyzer-checker=deadcode -analyzer-checker=cplusplus -analyzer-checker=security.insecureAPI.UncheckedReturn -analyzer-checker=security.insecureAPI.getpw -analyzer-checker=security.insecureAPI.gets -analyzer-checker=security.insecureAPI.mktemp -analyzer-checker=security.insecureAPI.mkstemp -analyzer-checker=security.insecureAPI.vfork -analyzer-checker=nullability.NullPassedToNonnull -analyzer-checker=nullability.NullReturnedFromNonnull -analyzer-output plist -w -setup-static-analyzer -mrelocation-model pic -pic-level 2 -fhalf-no-semantic-interposition -mframe-pointer=all -fmath-errno -ffp-contract=on -fno-rounding-math -mconstructor-aliases -funwind-tables=2 -target-cpu x86-64 -tune-cpu generic -debugger-tuning=gdb -fdebug-compilation-dir=/home/gilles/devel/8.x/build.scan/core/libs/threadimageio -fcoverage-compilation-dir=/home/gilles/devel/8.x/build.scan/core/libs/threadimageio -resource-dir /usr/lib/llvm-19/lib/clang/19 -D BUILDING_XMPCOMPAREANDMERGE_AS_STATIC=1 -D BUILDING_XMPCOMPAREANDMERGE_LIB=1 -D BanAllEntityUsage=1 -D CMS_NO_REGISTER_KEYWORD=1 -D EnablePluginManager=0 -D HAVE_FFMPEG_VERSION5 -D LIBPGF_DISABLE_OPENMP -D LINKING_XMPCORE_LIB=1 -D MAGICKCORE_HDRI_ENABLE=0 -D MAGICKCORE_QUANTUM_DEPTH=16 -D QT_DEPRECATED_WARNINGS -D QT_DEPRECATED_WARNINGS_SINCE=0x060000 -D QT_DISABLE_DEPRECATED_BEFORE=0x050E00 -D QT_NO_CAST_FROM_ASCII -D QT_NO_CAST_FROM_BYTEARRAY -D QT_NO_CAST_TO_ASCII -D QT_NO_FOREACH -D QT_NO_KEYWORDS -D QT_NO_NARROWING_CONVERSIONS_IN_CONNECT -D QT_NO_URL_CAST_FROM_STRING -D QT_STRICT_ITERATORS -D QT_USE_QSTRINGBUILDER -D TRANSLATION_DOMAIN="digikam" -D UNIX_ENV=1 -D USE_JASPER -D USE_JPEG -D USE_JPEG8 -D XMP_COMPONENT_INT_NAMESPACE=AdobeXMPCompareAndMerge_Int -D XMP_StaticBuild=1 -D _GNU_SOURCE -D _LARGEFILE64_SOURCE -D digikamcore_EXPORTS -D qDNGDebug=0 -D qDNGLittleEndian=1 -D qDNGThreadSafe=1 -D qDNGUseLibJPEG=1 -D qDNGUseStdInt=1 -D qDNGUseXMP=1 -D qDNGValidateTarget=1 -D qDNGXMPDocOps=0 -D qDNGXMPFiles=0 -D qLinux=1 -D qMacOS=0 -D qWinOS=0 -I /home/gilles/devel/8.x/build.scan/core/libs/threadimageio -I /home/gilles/devel/8.x/core/libs/threadimageio -I /home/gilles/devel/8.x/build.scan/core/libs/threadimageio/core_threadimageio_obj_autogen/include -I /home/gilles/devel/8.x/core/libs/video/player/qtmm -I /home/gilles/devel/8.x/core/libs/album/engine -I /home/gilles/devel/8.x/core/libs/album/manager -I /home/gilles/devel/8.x/core/libs/album/treeview -I /home/gilles/devel/8.x/core/libs/album/widgets -I /home/gilles/devel/8.x/core/libs/database/collection -I /home/gilles/devel/8.x/core/libs/database/coredb -I /home/gilles/devel/8.x/core/libs/database/dbjobs -I /home/gilles/devel/8.x/core/libs/database/engine -I 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/opt/qt6/include -I /opt/qt6/include/QtCore -I /opt/qt6/mkspecs/linux-g++ -I /opt/qt6/include/QtGui -I /opt/qt6/include/QtNetwork -I /opt/qt6/include/QtMultimediaWidgets -I /opt/qt6/include/QtWidgets -I /opt/qt6/include/QtSql -I /opt/qt6/include/KF6/KI18n -I /opt/qt6/include/KF6/KConfig -I /opt/qt6/include/KF6/KConfigCore -I /opt/qt6/include/KF6/KCoreAddons -I /opt/qt6/include/KF6/KService -I /opt/qt6/include/QtDBus -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/14/../../../../include/c++/14 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/14/../../../../include/x86_64-linux-gnu/c++/14 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/14/../../../../include/c++/14/backward -internal-isystem /usr/lib/llvm-19/lib/clang/19/include -internal-isystem /usr/local/include -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/14/../../../../x86_64-linux-gnu/include -internal-externc-isystem /usr/include/x86_64-linux-gnu -internal-externc-isystem /include -internal-externc-isystem /usr/include -Wno-long-long -Wno-deprecated-copy -std=c++20 -fdeprecated-macro -ferror-limit 19 -fvisibility=hidden -fvisibility-inlines-hidden -fno-operator-names -fopenmp -fgnuc-version=4.2.1 -fno-implicit-modules -fskip-odr-check-in-gmf -fcxx-exceptions -fexceptions -analyzer-output=html -faddrsig -D__GCC_HAVE_DWARF2_CFI_ASM=1 -o /home/gilles/devel/8.x/project/reports/report.scan/2025-01-21-132859-99447-1 -x c++ /home/gilles/devel/8.x/core/libs/threadimageio/thumb/thumbnailcreator_basic.cpp
1/* ============================================================
2 *
3 * This file is a part of digiKam project
4 * https://www.digikam.org
5 *
6 * Date : 2007-07-20
7 * Description : Loader for thumbnails
8 *
9 * SPDX-FileCopyrightText: 2003-2005 by Renchi Raju <renchi dot raju at gmail dot com>
10 * SPDX-FileCopyrightText: 2003-2025 by Gilles Caulier <caulier dot gilles at gmail dot com>
11 * SPDX-FileCopyrightText: 2006-2011 by Marcel Wiesweg <marcel dot wiesweg at gmx dot de>
12 *
13 * SPDX-License-Identifier: GPL-2.0-or-later
14 *
15 * ============================================================ */
16
17// C++ includes
18
19#include <cstdlib>
20#include <cstdio>
21#include <cstring>
22
23// Qt includes
24
25#include <QImage>
26#include <QDir>
27#include <QStandardPaths>
28#include <QCryptographicHash>
29#include <QUrl>
30
31// C ANSI includes
32
33extern "C"
34{
35#ifndef Q_CC_MSVC
36# include <unistd.h>
37#endif
38#include <sys/stat.h>
39#include <sys/types.h>
40
41#ifndef Q_OS_WIN32 // krazy:exclude=cpp
42# include <sys/ipc.h>
43# include <sys/shm.h>
44#endif
45
46#include <time.h>
47#include <png.h>
48}
49
50// Local includes
51
52#include "thumbnailcreator_p.h"
53
54// Definitions
55
56#define PNG_BYTES_TO_CHECK4 4
57
58namespace Digikam
59{
60
61// --- Static methods: Generate the thumbnail path according to FreeDesktop spec ---
62
63QString ThumbnailCreator::normalThumbnailDir()
64{
65 return (QStandardPaths::writableLocation(QStandardPaths::GenericCacheLocation) +
66 QLatin1String("/thumbnails/normal/"));
67}
68
69QString ThumbnailCreator::largeThumbnailDir()
70{
71 return (QStandardPaths::writableLocation(QStandardPaths::GenericCacheLocation) +
72 QLatin1String("/thumbnails/large/"));
73}
74
75QString ThumbnailCreator::thumbnailPath(const QString& filePath, const QString& basePath)
76{
77 return thumbnailPathFromUri(thumbnailUri(filePath), basePath);
78}
79
80QString ThumbnailCreator::thumbnailUri(const QString& filePath)
81{
82 return QUrl::fromLocalFile(filePath).url();
83}
84
85QString ThumbnailCreator::thumbnailPathFromUri(const QString& uri, const QString& basePath)
86{
87 QCryptographicHash md5(QCryptographicHash::Md5);
88 md5.addData(QFile::encodeName(uri).constData());
89
90 return (basePath +
91 QString::fromUtf8(QFile::encodeName(QString::fromUtf8(md5.result().toHex()))) +
92 QLatin1String(".png"));
93}
94
95// --- non-static methods ---
96
97void ThumbnailCreator::initThumbnailDirs()
98{
99 d->smallThumbPath = normalThumbnailDir();
100 d->bigThumbPath = largeThumbnailDir();
101
102 if (!QDir(d->smallThumbPath).exists())
103 {
104 if (QDir().mkpath(d->smallThumbPath))
105 {
106 QFile f(d->smallThumbPath);
107 f.setPermissions(QFile::ReadUser | QFile::WriteUser | QFile::ExeUser); // 0700
108 }
109 }
110
111 if (!QDir(d->bigThumbPath).exists())
112 {
113 if (QDir().mkpath(d->bigThumbPath))
114 {
115 QFile f(d->bigThumbPath);
116 f.setPermissions(QFile::ReadUser | QFile::WriteUser | QFile::ExeUser); // 0700
117 }
118 }
119}
120
121QString ThumbnailCreator::thumbnailPath(const QString& filePath) const
122{
123 QString basePath = (d->storageSize() == 128) ? d->smallThumbPath : d->bigThumbPath;
124
125 return thumbnailPath(filePath, basePath);
126}
127
128// --- Basic PNG loading ---
129
130QImage ThumbnailCreator::loadPNG(const QString& path) const
131{
132 png_uint_32 w32, h32;
133 int w, h;
134 bool has_alpha = 0;
135 png_structp png_ptr = nullptr;
136 png_infop info_ptr = nullptr;
137 int bit_depth, color_type, interlace_type;
138 QImage qimage;
139
140#ifdef Q_OS_WIN
141
142 FILE* const f = _wfopen((const wchar_t*)path.utf16(), L"rb");
143
144#else
145
146 FILE* const f = fopen(path.toUtf8().constData(), "rb");
147
148#endif
149
150 if (!f
0.1
'f' is non-null
)
1
Taking false branch
151 {
152 return qimage;
153 }
154
155 unsigned char buf[PNG_BYTES_TO_CHECK4];
156
157 size_t itemsRead = fread(buf, 1, PNG_BYTES_TO_CHECK4, f);
158
159#if PNG_LIBPNG_VER10644 >= 10400
160
161 if ((itemsRead
1.1
'itemsRead' is equal to PNG_BYTES_TO_CHECK
!= PNG_BYTES_TO_CHECK4) || png_sig_cmp(buf, 0, PNG_BYTES_TO_CHECK4))
2
Assuming the condition is false
3
Taking false branch
162
163#else
164
165 if ((itemsRead != PNG_BYTES_TO_CHECK4) || !png_check_sig(buf, PNG_BYTES_TO_CHECK)(png_sig_cmp((buf), 0, (4)) == 0))
166
167#endif
168 {
169 fclose(f);
170
171 return qimage;
172 }
173
174 rewind(f);
4
After calling 'rewind' reading 'errno' is required to find out if the call has failed
175
176 png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING"1.6.44", nullptr, nullptr, nullptr);
5
Value of 'errno' was not checked and may be overwritten by function 'png_create_read_struct'
177
178 if (!png_ptr)
179 {
180 fclose(f);
181
182 return qimage;
183 }
184
185 info_ptr = png_create_info_struct(png_ptr);
186
187 if (!info_ptr)
188 {
189 png_destroy_read_struct(&png_ptr, nullptr, nullptr);
190 fclose(f);
191
192 return qimage;
193 }
194
195#if PNG_LIBPNG_VER10644 >= 10400
196
197 if (setjmp(png_jmpbuf(png_ptr))_setjmp ((*png_set_longjmp_fn((png_ptr), longjmp, (sizeof (jmp_buf
)))))
)
198
199#else
200
201 if (setjmp(png_ptr->jmpbuf)_setjmp (png_ptr->jmpbuf))
202
203#endif
204 {
205 png_destroy_read_struct(&png_ptr, &info_ptr, nullptr);
206 fclose(f);
207
208 return qimage;
209 }
210
211 png_init_io(png_ptr, f);
212 png_read_info(png_ptr, info_ptr);
213 png_get_IHDR(png_ptr, info_ptr,
214 reinterpret_cast<png_uint_32*>(&w32),
215 reinterpret_cast<png_uint_32*>(&h32),
216 &bit_depth,
217 &color_type,
218 &interlace_type,
219 nullptr,
220 nullptr);
221
222 bool has_grey = 0;
223 w = w32;
224 h = h32;
225 qimage = QImage(w, h, QImage::Format_ARGB32);
226
227 if (color_type == PNG_COLOR_TYPE_PALETTE(2 | 1))
228 {
229 png_set_expand(png_ptr);
230 }
231
232#if PNG_LIBPNG_VER10644 >= 10400
233
234 png_byte info_color_type = png_get_color_type(png_ptr, info_ptr);
235
236#else
237
238 png_byte info_color_type = info_ptr->color_type;
239
240#endif
241
242 if (info_color_type == PNG_COLOR_TYPE_RGB_ALPHA(2 | 4))
243 {
244 has_alpha = 1;
245 }
246
247 if (info_color_type == PNG_COLOR_TYPE_GRAY_ALPHA(4))
248 {
249 has_alpha = 1;
250 has_grey = 1;
251 }
252
253 if (info_color_type == PNG_COLOR_TYPE_GRAY0)
254 {
255 has_grey = 1;
256 }
257
258 unsigned char** lines = nullptr;
259 int i;
260
261 if (has_alpha)
262 {
263 png_set_expand(png_ptr);
264 }
265
266 if (QSysInfo::ByteOrder == QSysInfo::LittleEndian) // Intel
267 {
268 png_set_filler(png_ptr, 0xff, PNG_FILLER_AFTER1);
269 png_set_bgr(png_ptr);
270 }
271 else // PPC
272 {
273 png_set_swap_alpha(png_ptr);
274 png_set_filler(png_ptr, 0xff, PNG_FILLER_BEFORE0);
275 }
276
277 // 16bit color -> 8bit color
278
279 if (bit_depth == 16)
280 {
281 png_set_strip_16(png_ptr);
282 }
283
284 // pack all pixels to byte boundaries
285
286 png_set_packing(png_ptr);
287
288 if (png_get_valid(png_ptr, info_ptr, PNG_INFO_tRNS0x0010U))
289 {
290 png_set_expand(png_ptr);
291 }
292
293 lines = reinterpret_cast<unsigned char**>(malloc(h * sizeof(unsigned char*)));
294
295 if (!lines)
296 {
297 png_read_end(png_ptr, info_ptr);
298 png_destroy_read_struct(&png_ptr, &info_ptr, (png_infopp) nullptr);
299 fclose(f);
300
301 return qimage;
302 }
303
304 if (has_grey)
305 {
306 png_set_gray_to_rgb(png_ptr);
307
308 if (png_get_bit_depth(png_ptr, info_ptr) < 8)
309
310#if PNG_LIBPNG_VER10644 >= 10400
311
312 png_set_expand_gray_1_2_4_to_8(png_ptr);
313#else
314
315 png_set_gray_1_2_4_to_8(png_ptr);
316
317#endif
318
319 }
320
321 int sizeOfUint = sizeof(unsigned int);
322
323 for (i = 0 ; i < h ; ++i)
324 {
325 lines[i] = (reinterpret_cast<unsigned char*>(qimage.bits())) + (i * w * sizeOfUint);
326 }
327
328 png_read_image(png_ptr, lines);
329 free(lines);
330
331 png_textp text_ptr;
332 int num_text = 0;
333 png_get_text(png_ptr,info_ptr, &text_ptr, &num_text);
334
335 while (num_text--)
336 {
337 qimage.setText(QString::fromUtf8(text_ptr->key), QString::fromUtf8(text_ptr->text));
338 ++text_ptr;
339 }
340
341 png_read_end(png_ptr, info_ptr);
342 png_destroy_read_struct(&png_ptr, &info_ptr, (png_infopp) nullptr);
343 fclose(f);
344
345 return qimage;
346}
347
348} // namespace Digikam