Bug 31934 - [gallium] Mapping empty buffer object causes SIGSEGV
Summary: [gallium] Mapping empty buffer object causes SIGSEGV
Status: RESOLVED FIXED
Alias: None
Product: Mesa
Classification: Unclassified
Component: Mesa core (show other bugs)
Version: git
Hardware: x86-64 (AMD64) Linux (All)
: medium normal
Assignee: mesa-dev
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Reported: 2010-11-26 04:54 UTC by Wiktor Janas
Modified: 2010-11-26 12:50 UTC (History)
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Description Wiktor Janas 2010-11-26 04:54:24 UTC
The following code triggers SIGSEGV at mesa/state_tracker/st_cb_bufferobjects.c:236, because st_obj->buffer is NULL.

#include <stdlib.h>

#define GL_GLEXT_PROTOTYPES
#include <GL/gl.h>
#include <GL/glut.h>

int main (int argc, char *argv[])
{
    glutInit(&argc, argv);
    glutInitDisplayMode(GLUT_RGBA);
    glutInitWindowSize(512,512);
    glutCreateWindow("");

    GLuint id;
    glGenBuffersARB(1, &id);
    glBindBufferARB(GL_ARRAY_BUFFER_ARB, id);
    glBufferDataARB(GL_ARRAY_BUFFER_ARB, 0, NULL, GL_STATIC_DRAW);
    glBindBufferARB(GL_ARRAY_BUFFER_ARB, 0);

    glBindBufferARB(GL_ARRAY_BUFFER_ARB, id);
    glMapBuffer(GL_ARRAY_BUFFER_ARB, GL_READ_WRITE_ARB); /* CRASH! */
    glBindBufferARB(GL_ARRAY_BUFFER_ARB, 0);

    return 0;
}
Comment 1 Brian Paul 2010-11-26 12:50:36 UTC
Fixed with commit 97ae4dad1cc24c5e969e6b99f07ece68e239964b.
Committed to the 7.9 branch too.  Thanks for the test program!


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