[Mesa-dev] [Bug 91673] Segfault when calling glTexSubImage2D on storage texture to bound FBO

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=91673

            Bug ID: 91673
           Summary: Segfault when calling glTexSubImage2D on storage
                    texture to bound FBO
           Product: Mesa
           Version: 10.5
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: major
          Priority: medium
         Component: GLX
          Assignee: mesa-dev at lists.freedesktop.org
          Reporter: dongseong.hwang at intel.com
        QA Contact: mesa-dev at lists.freedesktop.org

Counterpart chromium project issue:
https://code.google.com/p/chromium/issues/detail?id=521904

Following code causes segfault
    GLuint tex_;
    GLuint fbo_;
    glGenTextures(1, &tex_);
    glBindTexture(GL_TEXTURE_2D, tex_);

    glGenFramebuffers(1, &fbo_);
    glBindFramebuffer(GL_FRAMEBUFFER, fbo_);
    glFramebufferTexture2D(GL_FRAMEBUFFER,
                           GL_COLOR_ATTACHMENT0,
                           GL_TEXTURE_2D,
                           tex_,
                           0);

    glBindTexture(GL_TEXTURE_2D, tex_);
    glTexStorage2D(GL_TEXTURE_2D, 2, GL_RGBA8, 2, 2);

    // SEGFAULT
    glTexSubImage2D(GL_TEXTURE_2D,
                    0,
                    0, 0,
                    2, 2,
                    GL_RGBA, GL_UNSIGNED_BYTE,
                    source_pixels);


Here's buildable minimal case;
https://github.com/ds-hwang/opengl_snippets/blob/master/glx/texture_storage_fbo_crash.cpp

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