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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@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>
This commit is contained in:
Xiyu Yang 2021-06-10 10:49:20 +08:00 committed by Greg Kroah-Hartman
parent 3761ae0d0e
commit b11220803a
1 changed files with 6 additions and 2 deletions
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8
drivers/iommu/arm-smmu.c
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@ -1231,6 +1231,7 @@ 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)
@ -1249,6 +1250,7 @@ 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);
}
@ -1257,12 +1259,14 @@ static phys_addr_t arm_smmu_iova_to_phys_hard(struct iommu_domain *domain,
if (phys & 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,