From: Guenter Roeck <gro...@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, "larb_nr"
will be zero and cause abnormal.
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 <l...@intel.com>
Reported-by: Dan Carpenter <dan.carpen...@oracle.com>
Signed-off-by: Guenter Roeck <gro...@chromium.org>
Signed-off-by: Yong Wu <yong...@mediatek.com>
Reviewed-by: AngeloGioacchino Del Regno
<angelogioacchino.delre...@collabora.com>
---
drivers/iommu/mtk_iommu.c | 11 +++++++++++
1 file changed, 11 insertions(+)
diff --git a/drivers/iommu/mtk_iommu.c b/drivers/iommu/mtk_iommu.c
index ab24078938bf..a869d4aee7b3 100644
--- a/drivers/iommu/mtk_iommu.c
+++ b/drivers/iommu/mtk_iommu.c
@@ -1052,6 +1052,8 @@ static int mtk_iommu_mm_dts_parse(struct device *dev,
struct component_match **m
larb_nr = of_count_phandle_with_args(dev->of_node, "mediatek,larbs",
NULL);
if (larb_nr < 0)
return larb_nr;
+ if (larb_nr == 0 || larb_nr > MTK_LARB_NR_MAX)
+ return -EINVAL;
for (i = 0; i < larb_nr; i++) {
u32 id;
@@ -1068,6 +1070,10 @@ static int mtk_iommu_mm_dts_parse(struct device *dev,
struct component_match **m
ret = of_property_read_u32(larbnode, "mediatek,larb-id", &id);
if (ret)/* The id is consecutive if there is no this property */
id = i;
+ if (id >= MTK_LARB_NR_MAX) {
+ ret = -EINVAL;
+ goto err_larbnode_put;
+ }
plarbdev = of_find_device_by_node(larbnode);
if (!plarbdev) {
@@ -1078,6 +1084,11 @@ static int mtk_iommu_mm_dts_parse(struct device *dev,
struct component_match **m
ret = -EPROBE_DEFER;
goto err_larbnode_put;
}
+
+ if (data->larb_imu[id].dev) {
+ ret = -EEXIST;
+ goto err_larbnode_put;
+ }
data->larb_imu[id].dev = &plarbdev->dev;
component_match_add_release(dev, match, component_release_of,
--
2.18.0
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