From: Sasha Levin <sashal@kernel.org>
To: linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc: Xiyu Yang <xiyuyang19@fudan.edu.cn>,
Xin Tan <tanxin.ctf@gmail.com>,
Rob Clark <robdclark@chromium.org>, Will Deacon <will@kernel.org>,
Sasha Levin <sashal@kernel.org>,
linux-arm-kernel@lists.infradead.org,
iommu@lists.linux-foundation.org
Subject: [PATCH AUTOSEL 5.13 066/114] iommu/arm-smmu: Fix arm_smmu_device refcount leak in address translation
Date: Fri, 9 Jul 2021 22:17:00 -0400 [thread overview]
Message-ID: <20210710021748.3167666-66-sashal@kernel.org> (raw)
In-Reply-To: <20210710021748.3167666-1-sashal@kernel.org>
From: Xiyu Yang <xiyuyang19@fudan.edu.cn>
[ 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@fudan.edu.cn>
Signed-off-by: Xin Tan <tanxin.ctf@gmail.com>
Reviewed-by: Rob Clark <robdclark@chromium.org>
Link: https://lore.kernel.org/r/1623293391-17261-1-git-send-email-xiyuyang19@fudan.edu.cn
Signed-off-by: Will Deacon <will@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/iommu/arm/arm-smmu/arm-smmu.c | 8 ++++++--
1 file changed, 6 insertions(+), 2 deletions(-)
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,
--
2.30.2
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next prev parent reply other threads:[~2021-07-10 2:21 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20210710021748.3167666-1-sashal@kernel.org>
2021-07-10 2:16 ` [PATCH AUTOSEL 5.13 024/114] usb: common: usb-conn-gpio: fix NULL pointer dereference of charger Sasha Levin
2021-07-10 2:16 ` [PATCH AUTOSEL 5.13 051/114] mfd: da9052/stmpe: Add and modify MODULE_DEVICE_TABLE Sasha Levin
2021-07-10 2:16 ` [PATCH AUTOSEL 5.13 056/114] fsi: Add missing MODULE_DEVICE_TABLE Sasha Levin
2021-07-10 2:16 ` [PATCH AUTOSEL 5.13 061/114] iommu/arm-smmu-qcom: Skip the TTBR1 quirk for db820c Sasha Levin
2021-07-10 2:16 ` [PATCH AUTOSEL 5.13 065/114] iommu/arm-smmu: Fix arm_smmu_device refcount leak when arm_smmu_rpm_get fails Sasha Levin
2021-07-10 2:17 ` Sasha Levin [this message]
2021-07-10 2:17 ` [PATCH AUTOSEL 5.13 070/114] gpio: zynq: Check return value of pm_runtime_get_sync Sasha Levin
2021-07-10 2:17 ` [PATCH AUTOSEL 5.13 071/114] gpio: zynq: Check return value of irq_get_irq_data Sasha Levin
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