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iommu/msm: Limit the per-master Machine ID list

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The OF translation path appends each unique stream ID from an IOMMU
specifier to the fixed mids array in the per-master object. It currently
has no capacity check before storing at mids[num_mids] and incrementing
num_mids.

Return -ENOSPC when the array is full rather than writing the next ID
beyond it.

Signed-off-by: Pengpeng Hou <pengpeng@iscas.ac.cn>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
Signed-off-by: Will Deacon <will@kernel.org>
This commit is contained in:
Pengpeng Hou 2026-07-22 12:16:19 +08:00 committed by Will Deacon
parent b0d50c9016
commit 649e5ef836
1 changed files with 3 additions and 0 deletions
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3
drivers/iommu/msm_iommu.c
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@ -622,6 +622,9 @@ static int insert_iommu_master(struct device *dev,
return 0;
}
if (master->num_mids >= MAX_NUM_MIDS)
return -ENOSPC;
master->mids[master->num_mids++] = spec->args[0];
return 0;
}