[PATCH 3/4] iommu/mediatek: Validate number of phandles associated with "mediatek,larbs"

[AngeloGioacchino Del Regno]

Il 11/05/22 08:49, Yong Wu ha scritto:
> From: Guenter Roeck <groeck at chromium.org>
> 
> Fix the smatch warnings:
> drivers/iommu/mtk_iommu.c:878 mtk_iommu_mm_dts_parse() error: uninitialized
> symbol 'larbnode'.
> 
> If someone abuse the dtsi node(Don't follow the definition of dt-binding),
> for example "mediatek,larbs" is provided as boolean property, the code may
> crash. To fix this problem and improve the code safety, add some checking
> for the invalid input from dtsi, e.g. checking the larb_nr/larbid valid
> range, and avoid "mediatek,larb-id" property conflicts in the smi-larb
> nodes.
> 
> Fixes: d2e9a1102cfc ("iommu/mediatek: Contain MM IOMMU flow with the MM TYPE")
> Reported-by: kernel test robot <lkp at intel.com>
> Reported-by: Dan Carpenter <dan.carpenter at oracle.com>
> Signed-off-by: Guenter Roeck <groeck at chromium.org>
> Signed-off-by: Yong Wu <yong.wu at mediatek.com>

Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno at collabora.com>