media: verisilicon: rockchip: guard VPU981 AV1 divisor and tile buffer

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rockchip_vpu981_av1_dec_set_tile_info() divides context_update_tile_id by
tile_info->tile_cols and writes one descriptor per tile into the tile_info
DMA buffer, which holds AV1_MAX_TILES entries; tile_cols and tile_rows
come from the bitstream. Guard the division against a zero tile_cols by
initialising the context-update values to zero and computing them only
when tile_cols is non-zero, and stop the descriptor writes once the
tile_info buffer is full. The tile geometry written to the hardware
registers is left unmodified; the per-dimension and total tile bounds are
enforced by the control validation.

Fixes: 727a400686 ("media: verisilicon: Add Rockchip AV1 decoder")
Assisted-by: Claude:claude-opus-4-8
Cc: stable@vger.kernel.org
Signed-off-by: Michael Bommarito <michael.bommarito@gmail.com>
Reviewed-by: Benjamin Gaignard <benjamin.gaignard@collabora.com>
Signed-off-by: Hans Verkuil <hverkuil+cisco@kernel.org>

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Michael Bommarito 2026-06-16 22:19:03 -04:00 • committed by Hans Verkuil

parent 06236b094c

commit b84f6533a8

1 changed files with 26 additions and 6 deletions

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drivers/media/platform/verisilicon/rockchip_vpu981_hw_av1_dec.c

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