iommu/arm-smmu: Fix arm_smmu_device refcount leak in address translation

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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>

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Xiyu Yang 2021-06-10 10:49:20 +08:00 • committed by Will Deacon

parent 1adf30f198

commit 7c8f176d6a

1 changed files with 6 additions and 2 deletions

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drivers/iommu/arm/arm-smmu/arm-smmu.c

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