linux-kernel - Re: [PATCH] drivers: nvdimm: fix dereference after free

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Message-ID: <x49jzttu4e2.fsf@segfault.boston.devel.redhat.com>
Date:   Thu, 17 Aug 2023 10:31:33 -0400
From:   Jeff Moyer <jmoyer@...hat.com>
To:     Konstantin Meskhidze <konstantin.meskhidze@...wei.com>
Cc:     <dan.j.williams@...el.com>, <vishal.l.verma@...el.com>,
        <dave.jiang@...el.com>, <ira.weiny@...el.com>,
        <nvdimm@...ts.linux.dev>, <linux-kernel@...r.kernel.org>,
        <yusongping@...wei.com>, <artem.kuzin@...wei.com>
Subject: Re: [PATCH] drivers: nvdimm: fix dereference after free

Konstantin Meskhidze <konstantin.meskhidze@...wei.com> writes:

> 'nd_pmu->pmu.attr_groups' is dereferenced in function
> 'nvdimm_pmu_free_hotplug_memory' call after it has been freed. Because in
> function 'nvdimm_pmu_free_hotplug_memory' memory pointed by the fields of
> 'nd_pmu->pmu.attr_groups' is deallocated it is necessary to call 'kfree'
> after 'nvdimm_pmu_free_hotplug_memory'.
>
> Co-developed-by: Ivanov Mikhail <ivanov.mikhail1@...wei-partners.com>
> Signed-off-by: Konstantin Meskhidze <konstantin.meskhidze@...wei.com>
> ---
>  drivers/nvdimm/nd_perf.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/nvdimm/nd_perf.c b/drivers/nvdimm/nd_perf.c
> index 14881c4e0..2b6dc80d8 100644
> --- a/drivers/nvdimm/nd_perf.c
> +++ b/drivers/nvdimm/nd_perf.c
> @@ -307,10 +307,10 @@ int register_nvdimm_pmu(struct nvdimm_pmu *nd_pmu, struct platform_device *pdev)
>  	}
>  
>  	rc = perf_pmu_register(&nd_pmu->pmu, nd_pmu->pmu.name, -1);
>  	if (rc) {
> -		kfree(nd_pmu->pmu.attr_groups);
>  		nvdimm_pmu_free_hotplug_memory(nd_pmu);
> +		kfree(nd_pmu->pmu.attr_groups);
>  		return rc;
>  	}
>  
>  	pr_info("%s NVDIMM performance monitor support registered\n",

Reviewed-by: Jeff Moyer <jmoyer@...hat.com>