This is a note to let you know that I've just added the patch titled
iommu/arm-smmu: Fix arm_smmu_device refcount leak in address translation
to the 5.13-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
iommu-arm-smmu-fix-arm_smmu_device-refcount-leak-in-.patch
and it can be found in the queue-5.13 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 57f80c7576760c73fd275f95894c5e75588ad3ae
Author: Xiyu Yang <xiyuyang19@xxxxxxxxxxxx>
Date: Thu Jun 10 10:49:20 2021 +0800
iommu/arm-smmu: Fix arm_smmu_device refcount leak in address translation
[ Upstream commit 7c8f176d6a3fa18aa0f8875da6f7c672ed2a8554 ]
The reference counting issue happens in several exception handling paths
of arm_smmu_iova_to_phys_hard(). When those error scenarios occur, the
function forgets to decrease the refcount of "smmu" increased by
arm_smmu_rpm_get(), causing a refcount leak.
Fix this issue by jumping to "out" label when those error scenarios
occur.
Signed-off-by: Xiyu Yang <xiyuyang19@xxxxxxxxxxxx>
Signed-off-by: Xin Tan <tanxin.ctf@xxxxxxxxx>
Reviewed-by: Rob Clark <robdclark@xxxxxxxxxxxx>
Link: https://lore.kernel.org/r/1623293391-17261-1-git-send-email-xiyuyang19@xxxxxxxxxxxx
Signed-off-by: Will Deacon <will@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/iommu/arm/arm-smmu/arm-smmu.c b/drivers/iommu/arm/arm-smmu/arm-smmu.c
index ee6cac9e7c02..1a647e0ea3eb 100644
--- a/drivers/iommu/arm/arm-smmu/arm-smmu.c
+++ b/drivers/iommu/arm/arm-smmu/arm-smmu.c
@@ -1271,6 +1271,7 @@ static phys_addr_t arm_smmu_iova_to_phys_hard(struct iommu_domain *domain,
u64 phys;
unsigned long va, flags;
int ret, idx = cfg->cbndx;
+ phys_addr_t addr = 0;
ret = arm_smmu_rpm_get(smmu);
if (ret < 0)
@@ -1290,6 +1291,7 @@ static phys_addr_t arm_smmu_iova_to_phys_hard(struct iommu_domain *domain,
dev_err(dev,
"iova to phys timed out on %pad. Falling back to software table walk.\n",
&iova);
+ arm_smmu_rpm_put(smmu);
return ops->iova_to_phys(ops, iova);
}
@@ -1298,12 +1300,14 @@ static phys_addr_t arm_smmu_iova_to_phys_hard(struct iommu_domain *domain,
if (phys & ARM_SMMU_CB_PAR_F) {
dev_err(dev, "translation fault!\n");
dev_err(dev, "PAR = 0x%llx\n", phys);
- return 0;
+ goto out;
}
+ addr = (phys & GENMASK_ULL(39, 12)) | (iova & 0xfff);
+out:
arm_smmu_rpm_put(smmu);
- return (phys & GENMASK_ULL(39, 12)) | (iova & 0xfff);
+ return addr;
}
static phys_addr_t arm_smmu_iova_to_phys(struct iommu_domain *domain,
