linux-kernel - Re: [PATCH next] kvm: debugfs: fix memory leak in kvm_create_vm

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Date:   Thu, 1 Jul 2021 16:24:50 -0500
From:   Jing Zhang <jingzhangos@...gle.com>
To:     Pavel Skripkin <paskripkin@...il.com>
Cc:     Paolo Bonzini <pbonzini@...hat.com>, KVM <kvm@...r.kernel.org>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH next] kvm: debugfs: fix memory leak in kvm_create_vm_debugfs

On Thu, Jul 1, 2021 at 2:55 PM Pavel Skripkin <paskripkin@...il.com> wrote:
>
> In commit bc9e9e672df9 ("KVM: debugfs: Reuse binary stats descriptors")
> loop for filling debugfs_stat_data was copy-pasted 2 times, but
> in the second loop pointers are saved over pointers allocated
> in the first loop. It causes memory leak. Fix it.
>
> Fixes: bc9e9e672df9 ("KVM: debugfs: Reuse binary stats descriptors")
> Signed-off-by: Pavel Skripkin <paskripkin@...il.com>
> ---
>  virt/kvm/kvm_main.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
> index 7d95126cda9e..986959833d70 100644
> --- a/virt/kvm/kvm_main.c
> +++ b/virt/kvm/kvm_main.c
> @@ -935,7 +935,7 @@ static int kvm_create_vm_debugfs(struct kvm *kvm, int fd)
>                 stat_data->kvm = kvm;
>                 stat_data->desc = pdesc;
>                 stat_data->kind = KVM_STAT_VCPU;
> -               kvm->debugfs_stat_data[i] = stat_data;
> +               kvm->debugfs_stat_data[i + kvm_vm_stats_header.num_desc] = stat_data;
Pavel, thanks for fixing this.

Reviewed-by: Jing Zhang <jingzhangos@...gle.com>
>                 debugfs_create_file(pdesc->name, kvm_stats_debugfs_mode(pdesc),
>                                     kvm->debugfs_dentry, stat_data,
>                                     &stat_fops_per_vm);
> --
> 2.32.0
>