From: Greg KH <gregkh@linuxfoundation.org>
To: Jiasheng Jiang <jiasheng@iscas.ac.cn>
Cc: stephen@networkplumber.org, kys@microsoft.com,
haiyangz@microsoft.com, sthemmin@microsoft.com,
wei.liu@kernel.org, decui@microsoft.com, davem@davemloft.net,
kuba@kernel.org, ast@kernel.org, daniel@iogearbox.net,
hawk@kernel.org, john.fastabend@gmail.com, andrii@kernel.org,
kafai@fb.com, songliubraving@fb.com, yhs@fb.com,
kpsingh@kernel.org, linux-hyperv@vger.kernel.org,
netdev@vger.kernel.org, linux-kernel@vger.kernel.org,
bpf@vger.kernel.org
Subject: Re: [PATCH] hv_netvsc: Add check for kvmalloc_array
Date: Fri, 11 Mar 2022 07:43:48 +0100 [thread overview]
Message-ID: <YirvpH4+KTyH2xTe@kroah.com> (raw)
In-Reply-To: <20220311032035.2037962-1-jiasheng@iscas.ac.cn>
On Fri, Mar 11, 2022 at 11:20:35AM +0800, Jiasheng Jiang wrote:
> As the potential failure of the kvmalloc_array(),
> it should be better to check and restore the 'data'
> if fails in order to avoid the dereference of the
> NULL pointer.
>
> Fixes: 6ae746711263 ("hv_netvsc: Add per-cpu ethtool stats for netvsc")
> Signed-off-by: Jiasheng Jiang <jiasheng@iscas.ac.cn>
> ---
> drivers/net/hyperv/netvsc_drv.c | 6 ++++++
> 1 file changed, 6 insertions(+)
>
> diff --git a/drivers/net/hyperv/netvsc_drv.c b/drivers/net/hyperv/netvsc_drv.c
> index 3646469433b1..018c4a5f6f44 100644
> --- a/drivers/net/hyperv/netvsc_drv.c
> +++ b/drivers/net/hyperv/netvsc_drv.c
> @@ -1587,6 +1587,12 @@ static void netvsc_get_ethtool_stats(struct net_device *dev,
> pcpu_sum = kvmalloc_array(num_possible_cpus(),
> sizeof(struct netvsc_ethtool_pcpu_stats),
> GFP_KERNEL);
> + if (!pcpu_sum) {
> + for (j = 0; j < i; j++)
> + data[j] = 0;
> + return;
> + }
How did you test this to verify it is correct?
thanks,
greg k-h
next prev parent reply other threads:[~2022-03-11 6:43 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-03-11 3:20 [PATCH] hv_netvsc: Add check for kvmalloc_array Jiasheng Jiang
2022-03-11 6:43 ` Greg KH [this message]
2022-03-11 17:25 ` Stephen Hemminger
-- strict thread matches above, loose matches on Subject: below --
2022-03-14 8:35 Jiasheng Jiang
2022-03-14 17:12 ` Jakub Kicinski
2022-03-14 8:05 Jiasheng Jiang
2022-03-14 8:13 ` Greg KH
2022-03-14 7:33 Jiasheng Jiang
2022-03-14 7:38 ` Greg KH
2022-03-14 1:56 Jiasheng Jiang
2022-03-11 3:20 Jiasheng Jiang
2022-03-11 2:43 Jiasheng Jiang
2022-03-11 3:00 ` Stephen Hemminger
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