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iommu_gas_match_one(): check for underflow

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Sponsored by:	The FreeBSD Foundation
MFC after:	1 week
This commit is contained in:
Konstantin Belousov 2023-12-26 02:57:00 +02:00
parent 7153d5e4bc
commit a869643e18
1 changed files with 2 additions and 0 deletions
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2
sys/dev/iommu/iommu_gas.c
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@ -329,6 +329,8 @@ iommu_gas_match_one(struct iommu_gas_match_args *a, iommu_gaddr_t beg,
start = roundup2(beg, a->common->alignment);
if (start < beg)
return (false);
if (end < IOMMU_PAGE_SIZE + 1)
return (false);
end = MIN(end - IOMMU_PAGE_SIZE - 1, ubound);
offset = a->offset;
size = a->size;