* [PATCH] iommu/arm-smmu-v3: Fix not checking return value about devm_add_action
@ 2020-12-07 11:23 Tian Tao
2020-12-07 11:29 ` Will Deacon
0 siblings, 1 reply; 2+ messages in thread
From: Tian Tao @ 2020-12-07 11:23 UTC (permalink / raw)
To: will, robin.murphy, joro, jean-philippe, Jonathan.Cameron, song.bao.hua
Cc: iommu, linux-kernel, linux-arm-kernel
Use devm_add_action_or_reset to avoid the situation where the release
function is not called when devm_add_action returns an error.
Signed-off-by: Tian Tao <tiantao6@hisilicon.com>
v2:
check the return value about evm_add_action_or_reset()
---
drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
index 2ddf5ec..76c28e7 100644
--- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
+++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
@@ -2680,7 +2680,8 @@ static int arm_smmu_cmdq_init(struct arm_smmu_device *smmu)
ret = -ENOMEM;
} else {
cmdq->valid_map = bitmap;
- devm_add_action(smmu->dev, arm_smmu_cmdq_free_bitmap, bitmap);
+ ret = devm_add_action_or_reset(smmu->dev,
+ arm_smmu_cmdq_free_bitmap, bitmap);
}
return ret;
@@ -2938,7 +2939,7 @@ static void arm_smmu_setup_msis(struct arm_smmu_device *smmu)
}
/* Add callback to free MSIs on teardown */
- devm_add_action(dev, arm_smmu_free_msis, dev);
+ devm_add_action_or_reset(dev, arm_smmu_free_msis, dev);
}
static void arm_smmu_setup_unique_irqs(struct arm_smmu_device *smmu)
--
2.7.4
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^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH] iommu/arm-smmu-v3: Fix not checking return value about devm_add_action
2020-12-07 11:23 [PATCH] iommu/arm-smmu-v3: Fix not checking return value about devm_add_action Tian Tao
@ 2020-12-07 11:29 ` Will Deacon
0 siblings, 0 replies; 2+ messages in thread
From: Will Deacon @ 2020-12-07 11:29 UTC (permalink / raw)
To: Tian Tao
Cc: jean-philippe, linux-kernel, iommu, robin.murphy, linux-arm-kernel
On Mon, Dec 07, 2020 at 07:23:29PM +0800, Tian Tao wrote:
> Use devm_add_action_or_reset to avoid the situation where the release
> function is not called when devm_add_action returns an error.
>
> Signed-off-by: Tian Tao <tiantao6@hisilicon.com>
>
> v2:
> check the return value about evm_add_action_or_reset()
> ---
> drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 5 +++--
> 1 file changed, 3 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
> index 2ddf5ec..76c28e7 100644
> --- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
> +++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
> @@ -2680,7 +2680,8 @@ static int arm_smmu_cmdq_init(struct arm_smmu_device *smmu)
> ret = -ENOMEM;
> } else {
> cmdq->valid_map = bitmap;
> - devm_add_action(smmu->dev, arm_smmu_cmdq_free_bitmap, bitmap);
> + ret = devm_add_action_or_reset(smmu->dev,
> + arm_smmu_cmdq_free_bitmap, bitmap);
> }
>
> return ret;
> @@ -2938,7 +2939,7 @@ static void arm_smmu_setup_msis(struct arm_smmu_device *smmu)
> }
>
> /* Add callback to free MSIs on teardown */
> - devm_add_action(dev, arm_smmu_free_msis, dev);
> + devm_add_action_or_reset(dev, arm_smmu_free_msis, dev);
Hmm, but you don't propagate the error here so couldn't this lead to a
use-after-free?
Will
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2020-12-07 11:23 [PATCH] iommu/arm-smmu-v3: Fix not checking return value about devm_add_action Tian Tao
2020-12-07 11:29 ` Will Deacon
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