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bdb2b933f2
When creating a dumb buffer object using the DRM_IOCTL_MODE_CREATE_DUMB IOCTL, only the width, height, bpp and flags fields are inputs. The caller is not guaranteed to zero out or set handle, pitch and size. Drivers must not treat these values as possible inputs, otherwise they may use uninitialized memory during the computation of the framebuffer size. The OMAP driver uses the pitch field passed in by userspace as a minimum and only override it if the driver-computed pitch is larger than what userspace provided. To prevent this from causing overallocation, fix the minimum pitch to 0 to enforce the driver-computed pitch. Cc: Tomi Valkeinen <tomi.valkeinen@ti.com> Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch> Reviewed-by: Rob Clark <robdclark@gmail.com> Acked-by: Tomi Valkeinen <tomi.valkeinen@ti.com> Signed-off-by: Thierry Reding <treding@nvidia.com> |
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