4.9-stable review patch. If anyone has any objections, please let me know.
------------------
From: Jean-Philippe Brucker <jean-philippe.brucker@xxxxxxx>
commit 57d72e159b60456c8bb281736c02ddd3164037aa upstream.
Kasan reports a double free when finalise_stage_fn fails: the io_pgtable
ops are freed by arm_smmu_domain_finalise and then again by
arm_smmu_domain_free. Prevent this by leaving pgtbl_ops empty on failure.
Fixes: 48ec83bcbcf5 ("iommu/arm-smmu: Add initial driver support for ARM SMMUv3 devices")
Reviewed-by: Robin Murphy <robin.murphy@xxxxxxx>
Signed-off-by: Jean-Philippe Brucker <jean-philippe.brucker@xxxxxxx>
Signed-off-by: Will Deacon <will.deacon@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/iommu/arm-smmu-v3.c | 8 +++++---
1 file changed, 5 insertions(+), 3 deletions(-)
--- a/drivers/iommu/arm-smmu-v3.c
+++ b/drivers/iommu/arm-smmu-v3.c
@@ -1547,13 +1547,15 @@ static int arm_smmu_domain_finalise(stru
domain->pgsize_bitmap = pgtbl_cfg.pgsize_bitmap;
domain->geometry.aperture_end = (1UL << ias) - 1;
domain->geometry.force_aperture = true;
- smmu_domain->pgtbl_ops = pgtbl_ops;
ret = finalise_stage_fn(smmu_domain, &pgtbl_cfg);
- if (ret < 0)
+ if (ret < 0) {
free_io_pgtable_ops(pgtbl_ops);
+ return ret;
+ }
- return ret;
+ smmu_domain->pgtbl_ops = pgtbl_ops;
+ return 0;
}
static __le64 *arm_smmu_get_step_for_sid(struct arm_smmu_device *smmu, u32 sid)