drm: rcar-du: Zero-out sg_tables when duplicating plane state

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The state structure for VSP-backed planes, rcar_du_vsp_plane_state,
contains sg tables that track framebuffer mapping performed in the
.prepare_fb() operation to unmap them in .cleanup_fb(). The tables are
incorrectly copied when duplicating state, which can result :

Zero-out sg_tables in original plane, effectively introducing move
semantic. Seems, this fixes issue with double-free,
when rcar_du_vsp_plane_cleanup_fb() freed the same sg_table
both in original plane and in the copy.

Reported-by: Volodymyr Babchuk <vlad.babchuk@gmail.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>

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This commit is contained in:

Laurent Pinchart 2018-01-17 22:18:41 +02:00

parent 6d08b06e67

commit 75a07f399c

1 changed files with 2 additions and 3 deletions

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drivers/gpu/drm/rcar-du/rcar_du_vsp.c

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