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Otherwise, the function would enable generic vertex attributes 0 and 1 of the array object it does not own. This was causing crashes in Euro Truck Simulator 2, since the incorrectly enabled generic attribute 0 in the foreign context got precedence before vertex position attribute at later time, leading to NULL pointer dereference. Cc: "9.2" <mesa-stable@lists.freedesktop.org> Cc: "10.0" <mesa-stable@lists.freedesktop.org> Signed-off-by: Petr Sebor <petr@scssoft.com> Reviewed-by: Ian Romanick <ian.d.romanick@intel.com> Reviewed-by: Brian Paul <brianp@vmware.com>