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openSUSE:Leap:15.4:Update
libqt5-qtbase.29707
0011-Fix-buffer-overflow-in-XBM-parser.patch
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File 0011-Fix-buffer-overflow-in-XBM-parser.patch of Package libqt5-qtbase.29707
From 6e7afbb742439e9c6b897e6ac26914f01fc07138 Mon Sep 17 00:00:00 2001 From: Allan Sandfeld Jensen <allan.jensen@qt.io> Date: Thu, 23 Jul 2020 11:48:48 +0200 Subject: [PATCH 11/11] Fix buffer overflow in XBM parser Avoid parsing over the buffer limit, or interpreting non-hex as hex. This still leaves parsing of lines longer than 300 chars unreliable Change-Id: I1c57a7e530c4380f6f9040b2ec729ccd7dc7a5fb Reviewed-by: Robert Loehning <robert.loehning@qt.io> Reviewed-by: Eirik Aavitsland <eirik.aavitsland@qt.io> (cherry picked from commit c562c1fc19629fb505acd0f6380604840b634211) Reviewed-by: Allan Sandfeld Jensen <allan.jensen@qt.io> (cherry picked from commit 35ecd0b69d58bcc8113afc5e449aef841c73e26c) --- src/gui/image/qxbmhandler.cpp | 4 +- .../image/qimagereader/tst_qimagereader.cpp | 37 +++++++++++++++++++ 2 files changed, 40 insertions(+), 1 deletion(-) diff --git a/src/gui/image/qxbmhandler.cpp b/src/gui/image/qxbmhandler.cpp index 7ba44049b4..8c4be4f0ed 100644 --- a/src/gui/image/qxbmhandler.cpp +++ b/src/gui/image/qxbmhandler.cpp @@ -158,7 +158,9 @@ static bool read_xbm_body(QIODevice *device, int w, int h, QImage *outImage) w = (w+7)/8; // byte width while (y < h) { // for all encoded bytes... - if (p) { // p = "0x.." + if (p && p < (buf + readBytes - 3)) { // p = "0x.." + if (!isxdigit(p[2]) || !isxdigit(p[3])) + return false; *b++ = hex2byte(p+2); p += 2; if (++x == w && ++y < h) { diff --git a/tests/auto/gui/image/qimagereader/tst_qimagereader.cpp b/tests/auto/gui/image/qimagereader/tst_qimagereader.cpp index 0135e48c7d..61b11a7779 100644 --- a/tests/auto/gui/image/qimagereader/tst_qimagereader.cpp +++ b/tests/auto/gui/image/qimagereader/tst_qimagereader.cpp @@ -168,6 +168,7 @@ private slots: void devicePixelRatio(); void xpmBufferOverflow(); + void xbmBufferHandling(); private: QString prefix; @@ -2010,5 +2011,41 @@ void tst_QImageReader::xpmBufferOverflow() QImageReader(":/images/oss-fuzz-23988.xpm").read(); } +void tst_QImageReader::xbmBufferHandling() +{ + uint8_t original_buffer[256]; + for (int i = 0; i < 256; ++i) + original_buffer[i] = i; + + QImage image(original_buffer, 256, 8, QImage::Format_MonoLSB); + image.setColorTable({0xff000000, 0xffffffff}); + + QByteArray buffer; + { + QBuffer buf(&buffer); + QImageWriter writer(&buf, "xbm"); + writer.write(image); + } + + QCOMPARE(QImage::fromData(buffer, "xbm"), image); + + auto i = buffer.indexOf(','); + buffer.insert(i + 1, " "); + QCOMPARE(QImage::fromData(buffer, "xbm"), image); + buffer.insert(i + 1, " "); + QCOMPARE(QImage::fromData(buffer, "xbm"), image); + buffer.insert(i + 1, " "); +#if 0 // Lines longer than 300 chars not supported currently + QCOMPARE(QImage::fromData(buffer, "xbm"), image); +#endif + + i = buffer.lastIndexOf("\n "); + buffer.truncate(i + 1); + buffer.append(QByteArray(297, ' ')); + buffer.append("0x"); + // Only check we get no buffer overflow + QImage::fromData(buffer, "xbm"); +} + QTEST_MAIN(tst_QImageReader) #include "tst_qimagereader.moc" -- 2.25.1
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