[PATCH rc] iommu/arm-smmu-v3: Revert vmaster in the error path
Pranjal Shrivastava
praan at google.com
Fri Jul 11 01:27:08 PDT 2025
On Thu, Jul 10, 2025 at 04:30:03PM -0700, Nicolin Chen wrote:
> The error path in the arm_smmu_attach_prepare() was introduced with the
> arm_smmu_enable_iopf(). Due to a rebase issue, it forgot to include the
> revert of the vmaster.
>
> Move kfree(state->vmaster) to the error path, to prevent memory leak.
>
> Fixes: cfea71aea921 ("iommu/arm-smmu-v3: Put iopf enablement in the domain attach path")
> Cc: stable at vger.kernel.org
> Signed-off-by: Nicolin Chen <nicolinc at nvidia.com>
Reviewed-by: Pranjal Shrivastava <praan at google.com>
Thanks!
Praan
> ---
> drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 7 ++++---
> 1 file changed, 4 insertions(+), 3 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 181d07bc1a9d..3c79cdbbd9e7 100644
> --- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
> +++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
> @@ -2906,8 +2906,8 @@ int arm_smmu_attach_prepare(struct arm_smmu_attach_state *state,
>
> master_domain = kzalloc(sizeof(*master_domain), GFP_KERNEL);
> if (!master_domain) {
> - kfree(state->vmaster);
> - return -ENOMEM;
> + ret = -ENOMEM;
> + goto err_free_vmaster;
> }
> master_domain->domain = new_domain;
> master_domain->master = master;
> @@ -2941,7 +2941,6 @@ int arm_smmu_attach_prepare(struct arm_smmu_attach_state *state,
> !arm_smmu_master_canwbs(master)) {
> spin_unlock_irqrestore(&smmu_domain->devices_lock,
> flags);
> - kfree(state->vmaster);
> ret = -EINVAL;
> goto err_iopf;
> }
> @@ -2967,6 +2966,8 @@ int arm_smmu_attach_prepare(struct arm_smmu_attach_state *state,
> arm_smmu_disable_iopf(master, master_domain);
> err_free_master_domain:
> kfree(master_domain);
> +err_free_vmaster:
> + kfree(state->vmaster);
> return ret;
> }
>
> --
> 2.43.0
>
>
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