lkml.org 
[lkml]   [2018]   [Jan]   [15]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH 4.4 16/87] iommu/arm-smmu-v3: Dont free page table ops twice
Date
4.4-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Jean-Philippe Brucker <jean-philippe.brucker@arm.com>

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@arm.com>
Signed-off-by: Jean-Philippe Brucker <jean-philippe.brucker@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
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
@@ -1541,13 +1541,15 @@ static int arm_smmu_domain_finalise(stru
return -ENOMEM;

arm_smmu_ops.pgsize_bitmap = pgtbl_cfg.pgsize_bitmap;
- smmu_domain->pgtbl_ops = pgtbl_ops;

ret = finalise_stage_fn(smmu_domain, &pgtbl_cfg);
- if (IS_ERR_VALUE(ret))
+ if (IS_ERR_VALUE(ret)) {
free_io_pgtable_ops(pgtbl_ops);
+ return ret;
+ }

- return ret;
+ smmu_domain->pgtbl_ops = pgtbl_ops;
+ return 0;
}

static struct arm_smmu_group *arm_smmu_group_get(struct device *dev)

\
 
 \ /
  Last update: 2018-01-15 15:19    [W:0.266 / U:16.224 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site