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iommu/sva: Fix signedness bug in iommu_sva_alloc_pasid() 

The ida_alloc_range() function returns negative error codes on error.
On success it returns values in the min to max range (inclusive).  It
never returns more then INT_MAX even if "max" is higher.  It never
returns values in the 0 to (min - 1) range.

The bug is that "min" is an unsigned int so negative error codes will
be promoted to high positive values errors treated as success.

Fixes: 1a14bf0fc7 ("iommu/sva: Use GFP_KERNEL for pasid allocation")
Signed-off-by: Dan Carpenter <error27@gmail.com>
Reviewed-by: Lu Baolu <baolu.lu@linux.intel.com>
Link: https://lore.kernel.org/r/6b32095d-7491-4ebb-a850-12e96209eaaf@kili.mountain
Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Dan Carpenter 2023-04-06 11:55:31 +03:00 committed by Joerg Roedel
parent 911476ef3c
commit c20ecf7bb6
1 changed files with 2 additions and 1 deletions
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3
drivers/iommu/iommu-sva.c
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@ -34,8 +34,9 @@ static int iommu_sva_alloc_pasid(struct mm_struct *mm, ioasid_t min, ioasid_t ma
}
ret = ida_alloc_range(&iommu_global_pasid_ida, min, max, GFP_KERNEL);
if (ret < min)
if (ret < 0)
goto out;
mm->pasid = ret;
ret = 0;
out: