[Mesa-dev] segfault in dri2 state tracker with TFP

[Dave Airlie]

Running texture_from_pixmap in xdemos against r300g

Program received signal SIGSEGV, Segmentation fault.
dri2_invalidate_drawable (dPriv=0x8066990) at dri2.c:57
57	   struct dri_context *ctx = dri_context(dPriv->driContextPriv);
Missing separate debuginfos, use: debuginfo-install
expat-2.0.1-8.fc12.i686 glew-1.5.4-1.fc14.i686 glibc-2.11.1-6.i686
libX11-1.3-1.fc12.i686 libXdamage-1.1.2-1.fc12.i686
libXext-1.1-2.fc12.i686 libXfixes-4.0.4-1.fc12.i686
libXxf86vm-1.1.0-1.fc12.i686 libdrm-2.4.21-0.1.fc14.i686
libgcc-4.4.3-4.fc12.i686 libselinux-2.0.90-5.fc12.i686
libstdc++-4.4.3-4.fc12.i686 libxcb-1.5-1.fc12.i686
mesa-libGLU-7.7-4.fc12.i686
(gdb) bt
#0  dri2_invalidate_drawable (dPriv=0x8066990) at dri2.c:57
#1  0xb7f9ee73 in dri2_bind_tex_image (dpy=0x804b008, drawable=75497476,
    buffer=8414, attrib_list=0x0) at dri2_glx.c:581
#2  0xb7f7dab6 in __glXBindTexImageEXT (dpy=0x804b008, drawable=75497476,
    buffer=8414, attrib_list=0x0) at glxcmds.c:3098
#3  0x0804978c in BindPixmapTexture (argc=1, argv=0xbffff304)
    at texture_from_pixmap.c:257
#4  main (argc=1, argv=0xbffff304) at texture_from_pixmap.c:391

dPriv->driContextPriv is NULL and dri_context macro derferences it.

attached patch "fixes" it but not sure if we want drI_context macro to
catch this or whether something else is doing something wrong and
causing this.

Dave.
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