Your message dated Mon, 18 Feb 2019 18:08:49 +0100 with message-id <[email protected]> and subject line Re: libftgl2: FTTextureFont crashes with large font-sizes has caused the Debian Bug report #744756, regarding libftgl2: FTTextureFont crashes with large font-sizes to be marked as done.
This means that you claim that the problem has been dealt with. If this is not the case it is now your responsibility to reopen the Bug report if necessary, and/or fix the problem forthwith. (NB: If you are a system administrator and have no idea what this message is talking about, this may indicate a serious mail system misconfiguration somewhere. Please contact [email protected] immediately.) -- 744756: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=744756 Debian Bug Tracking System Contact [email protected] with problems
--- Begin Message ---Package: libftgl2 Version: 2.1.3~rc5-4+nmu1 Severity: normal Tags: patch Dear Maintainer, using FTTextureFont can lead to a crash with a "Floating Point Exception". the problem only appears with very large font-sizes. my system: integrated intel gfx card (Ivybridge Mobile) mesa maximum texture size: 8192 how to reproduce: - create a FTTextureFont from /usr/share/fonts/truetype/ttf-dejavu/DejaVuSans.ttf (as found in the ttf-dejavu-core package) font=new FTGLTextureFont("/usr/share/fonts/truetype/ttf-dejavu/DejaVuSans.ttf") - set the fontsize to something large font->FaceSize(3033); - render the font font->Render("foo"); this will eventually hit the boundaries of the maximum texture size, leading to a division by zero in src/FTFont/FTTextureFont.cpp:186. this in turn crashes the host application. i'm attaching a short demo program (crasher.cpp; based on FTGL's simple.cpp) that increases the fontsize, until it crashes. compile with: $ g++ -o crasher crasher.cpp $(pkg-config --cflags --libs ftgl) -lglut -lGLU -lGL i'm also attaching a fix for the problem, that clamps the divisor to be >=1, thus making a division by zero impossible. fmgdsar IOhannes -- System Information: Debian Release: jessie/sid APT prefers unstable APT policy: (500, 'unstable'), (500, 'testing'), (1, 'experimental') Architecture: amd64 (x86_64) Foreign Architectures: i386 Kernel: Linux 3.13-1-amd64 (SMP w/4 CPU cores) Locale: LANG=en_US.utf8, LC_CTYPE=en_US.utf8 (charmap=UTF-8) Shell: /bin/sh linked to /bin/dash Versions of packages libftgl2 depends on: ii libc6 2.18-4 ii libfreetype6 2.5.2-1 ii libgcc1 1:4.8.2-19 ii libgl1-mesa-glx [libgl1] 10.1.0-5 ii libglu1-mesa [libglu1] 9.0.0-2 ii libpng12-0 1.2.50-1 ii libstdc++6 4.8.2-19 ii multiarch-support 2.18-4 ii zlib1g 1:1.2.8.dfsg-1 libftgl2 recommends no packages. libftgl2 suggests no packages. -- no debconf information#define FONT_FILE "/usr/share/fonts/truetype/ttf-dejavu/DejaVuSans.ttf" #include <stdlib.h> // exit() #include <GL/glut.h> #include <FTGL/ftgl.h> static FTFont *font; static int fontsize=1024; static void RenderScene(void) { char str[10]; GLint w, h; float scale=72./(float)fontsize; glGetTexLevelParameteriv(GL_TEXTURE_2D, 0, GL_TEXTURE_WIDTH, &w); glGetTexLevelParameteriv(GL_TEXTURE_2D, 0, GL_TEXTURE_HEIGHT, &h); snprintf(str, 9, "%d", fontsize); str[9]=0; font->FaceSize(fontsize); fprintf(stderr, "facesize=%d\ttexture=%dx%d\n", fontsize, w, h); fontsize+=10; glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); glEnable(GL_DEPTH_TEST); glPushMatrix(); glTranslatef(-260.0, -0.2, 20.0); glColor3f(1.0, 1.0, 1.0); glScalef(scale, scale, scale); font->Render(str); glPopMatrix(); glutSwapBuffers(); } // // Main program entry point: set up GLUT window, load fonts, run GLUT loop. // int main(int argc, char **argv) { char const *file = NULL; file = FONT_FILE; if(argc > 1) { file = argv[1]; } // Initialise GLUT stuff glutInit(&argc, argv); glutInitDisplayMode(GLUT_DEPTH | GLUT_DOUBLE | GLUT_RGBA); glutInitWindowPosition(100, 100); glutInitWindowSize(640, 480); glutCreateWindow("simple FTGL C++ demo"); glutDisplayFunc(RenderScene); glutIdleFunc(RenderScene); glMatrixMode(GL_PROJECTION); glLoadIdentity(); gluPerspective(90, 640.0f / 480.0f, 1, 1000); glMatrixMode(GL_MODELVIEW); glLoadIdentity(); gluLookAt(0.0, 0.0, 640.0f / 2.0f, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0); // Initialise FTGL stuff font = new FTTextureFont(file); if(font->Error()) { fprintf(stderr, "%s: could not load font `%s'\n", argv[0], file); return EXIT_FAILURE; } font->FaceSize(10); font->Depth(10); font->Outset(0, 3); font->CharMap(ft_encoding_unicode); // Run GLUT loop glutMainLoop(); return EXIT_SUCCESS; }>From eee58e1a78af5439398cc0014809c0e994191d08 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?IOhannes=20m=20zm=C3=B6lnig?= <[email protected]> Date: Mon, 14 Apr 2014 13:41:52 +0200 Subject: [PATCH] fix floating point exception clamp minimum height of texture to 1, so we don't get a division-by-zero on very large texture sizes --- src/FTFont/FTTextureFont.cpp | 1 + 1 file changed, 1 insertion(+) diff --git a/src/FTFont/FTTextureFont.cpp b/src/FTFont/FTTextureFont.cpp index 4e385ea..4c93598 100644 --- a/src/FTFont/FTTextureFont.cpp +++ b/src/FTFont/FTTextureFont.cpp @@ -181,6 +181,7 @@ void FTTextureFontImpl::CalculateTextureSize() textureWidth = textureWidth > maximumGLTextureSize ? maximumGLTextureSize : textureWidth; int h = static_cast<int>((textureWidth - (padding * 2)) / glyphWidth + 0.5); + if(h<1)h=1; textureHeight = NextPowerOf2(((numGlyphs / h) + 1) * glyphHeight); textureHeight = textureHeight > maximumGLTextureSize ? maximumGLTextureSize : textureHeight; -- 1.9.1
--- End Message ---
--- Begin Message ---Version: 2.3.0-1 Hi, 2014-04-14 14:13 IOhannes m zmoelnig:Package: libftgl2 Version: 2.1.3~rc5-4+nmu1 Severity: normal Tags: patch Dear Maintainer, using FTTextureFont can lead to a crash with a "Floating Point Exception". the problem only appears with very large font-sizes. my system: integrated intel gfx card (Ivybridge Mobile) mesa maximum texture size: 8192 how to reproduce: - create a FTTextureFont from /usr/share/fonts/truetype/ttf-dejavu/DejaVuSans.ttf (as found in the ttf-dejavu-core package) font=new FTGLTextureFont("/usr/share/fonts/truetype/ttf-dejavu/DejaVuSans.ttf") - set the fontsize to something large font->FaceSize(3033); - render the font font->Render("foo"); this will eventually hit the boundaries of the maximum texture size, leading to a division by zero in src/FTFont/FTTextureFont.cpp:186. this in turn crashes the host application. i'm attaching a short demo program (crasher.cpp; based on FTGL's simple.cpp) that increases the fontsize, until it crashes. compile with: $ g++ -o crasher crasher.cpp $(pkg-config --cflags --libs ftgl) -lglut -lGLU -lGL i'm also attaching a fix for the problem, that clamps the divisor to be >=1, thus making a division by zero impossible.I attempted to reproduce the problem with your crasher application and I couldn't. There were changes in that area of the code, some mentioning the same problem, e.g.: https://github.com/frankheckenbach/ftgl/commit/2723c7d33b904ce25346d6c0253ecdf1efd36e98#diff-89082f0e702c2508944ab360a432aaf4 Frank (in copy) also confirmed that the bug had been addressed. So I think that we can close this now. Thanks for the report in any case! Cheers. -- Manuel A. Fernandez Montecelo <[email protected]>
--- End Message ---
