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Date: Tue, 13 Jun 2017 15:39:26 +1200
From: Murray McAllister <>
Subject: Linux kernel: drm/vmwgfx: 4 byte read of uninitialised kernel memory
 in vmw_gb_surface_define_ioctl()

The vmw_gb_surface_define_ioctl() function (accessible via
DRM_IOCTL_VMW_GB_SURFACE_CREATE) defines a backup_handle variable but
does not give it an initial value. If you attempt to create a GB
surface, and provide a previously-allocated DMA buffer to be used as a
backup buffer, the backup_handle variable does not get written to and is
then later returned to user-space.

Upstream commit:


I'll request one now and reply once I have one.


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