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| author | Robin Murphy <robin.murphy@arm.com> | 2017-09-19 16:48:40 +0300 |
|---|---|---|
| committer | Joerg Roedel <jroedel@suse.de> | 2017-09-28 15:57:15 +0300 |
| commit | b826ee9a4f1cbf83cadc5a307de8eea27637699a (patch) | |
| tree | 6d847b28d7d22ec08e56d2e14b9bbda1e9fead1f /drivers/iommu/iova.c | |
| parent | 7595dc588a39c37091ddf65f6c0a3cd40f128e7a (diff) | |
| download | linux-b826ee9a4f1cbf83cadc5a307de8eea27637699a.tar.xz | |
iommu/iova: Make rcache limit_pfn handling more robust
When popping a pfn from an rcache, we are currently checking it directly
against limit_pfn for viability. Since this represents iova->pfn_lo, it
is technically possible for the corresponding iova->pfn_hi to be greater
than limit_pfn. Although we generally get away with it in practice since
limit_pfn is typically a power-of-two boundary and the IOVAs are
size-aligned, it's pretty trivial to make the iova_rcache_get() path
take the allocation size into account for complete safety.
Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Diffstat (limited to 'drivers/iommu/iova.c')
| -rw-r--r-- | drivers/iommu/iova.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/drivers/iommu/iova.c b/drivers/iommu/iova.c index ca21196c1f2d..15ff3033bbd7 100644 --- a/drivers/iommu/iova.c +++ b/drivers/iommu/iova.c @@ -406,7 +406,7 @@ alloc_iova_fast(struct iova_domain *iovad, unsigned long size, unsigned long iova_pfn; struct iova *new_iova; - iova_pfn = iova_rcache_get(iovad, size, limit_pfn); + iova_pfn = iova_rcache_get(iovad, size, limit_pfn + 1); if (iova_pfn) return iova_pfn; @@ -823,7 +823,7 @@ static unsigned long iova_magazine_pop(struct iova_magazine *mag, { BUG_ON(iova_magazine_empty(mag)); - if (mag->pfns[mag->size - 1] >= limit_pfn) + if (mag->pfns[mag->size - 1] > limit_pfn) return 0; return mag->pfns[--mag->size]; @@ -977,7 +977,7 @@ static unsigned long iova_rcache_get(struct iova_domain *iovad, if (log_size >= IOVA_RANGE_CACHE_MAX_SIZE) return 0; - return __iova_rcache_get(&iovad->rcaches[log_size], limit_pfn); + return __iova_rcache_get(&iovad->rcaches[log_size], limit_pfn - size); } /* |