* [PATCH] hv_netvsc: Fix potential dereference of NULL pointer
@ 2022-05-19 12:09 Yongzhi Liu
2022-05-19 13:45 ` Haiyang Zhang
2022-05-21 1:00 ` patchwork-bot+netdevbpf
0 siblings, 2 replies; 3+ messages in thread
From: Yongzhi Liu @ 2022-05-19 12:09 UTC (permalink / raw)
To: kys, haiyangz, sthemmin, wei.liu, decui, davem, kuba, pabeni, sashal
Cc: linux-hyperv, netdev, linux-kernel, fuyq, Yongzhi Liu
The return value of netvsc_devinfo_get()
needs to be checked to avoid use of NULL
pointer in case of an allocation failure.
Fixes: 0efeea5fb ("hv_netvsc: Add the support of hibernation")
Signed-off-by: Yongzhi Liu <lyz_cs@pku.edu.cn>
---
drivers/net/hyperv/netvsc_drv.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/drivers/net/hyperv/netvsc_drv.c b/drivers/net/hyperv/netvsc_drv.c
index fde1c49..b1dece6 100644
--- a/drivers/net/hyperv/netvsc_drv.c
+++ b/drivers/net/hyperv/netvsc_drv.c
@@ -2671,7 +2671,10 @@ static int netvsc_suspend(struct hv_device *dev)
/* Save the current config info */
ndev_ctx->saved_netvsc_dev_info = netvsc_devinfo_get(nvdev);
-
+ if (!ndev_ctx->saved_netvsc_dev_info) {
+ ret = -ENOMEM;
+ goto out;
+ }
ret = netvsc_detach(net, nvdev);
out:
rtnl_unlock();
--
2.7.4
^ permalink raw reply related [flat|nested] 3+ messages in thread
* RE: [PATCH] hv_netvsc: Fix potential dereference of NULL pointer
2022-05-19 12:09 [PATCH] hv_netvsc: Fix potential dereference of NULL pointer Yongzhi Liu
@ 2022-05-19 13:45 ` Haiyang Zhang
2022-05-21 1:00 ` patchwork-bot+netdevbpf
1 sibling, 0 replies; 3+ messages in thread
From: Haiyang Zhang @ 2022-05-19 13:45 UTC (permalink / raw)
To: Yongzhi Liu, KY Srinivasan, Stephen Hemminger, wei.liu,
Dexuan Cui, davem, kuba, pabeni, sashal
Cc: linux-hyperv, netdev, linux-kernel, fuyq
> -----Original Message-----
> From: Yongzhi Liu <lyz_cs@pku.edu.cn>
> Sent: Thursday, May 19, 2022 8:10 AM
> To: KY Srinivasan <kys@microsoft.com>; Haiyang Zhang
> <haiyangz@microsoft.com>; Stephen Hemminger
> <sthemmin@microsoft.com>; wei.liu@kernel.org; Dexuan Cui
> <decui@microsoft.com>; davem@davemloft.net; kuba@kernel.org;
> pabeni@redhat.com; sashal@kernel.org
> Cc: linux-hyperv@vger.kernel.org; netdev@vger.kernel.org; linux-
> kernel@vger.kernel.org; fuyq@stu.pku.edu.cn; Yongzhi Liu
> <lyz_cs@pku.edu.cn>
> Subject: [PATCH] hv_netvsc: Fix potential dereference of NULL pointer
>
> [Some people who received this message don't often get email from
> lyz_cs@pku.edu.cn. Learn why this is important at
> https://aka.ms/LearnAboutSenderIdentification.]
>
> The return value of netvsc_devinfo_get()
> needs to be checked to avoid use of NULL
> pointer in case of an allocation failure.
>
> Fixes: 0efeea5fb ("hv_netvsc: Add the support of hibernation")
>
> Signed-off-by: Yongzhi Liu <lyz_cs@pku.edu.cn>
> ---
> drivers/net/hyperv/netvsc_drv.c | 5 ++++-
> 1 file changed, 4 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/net/hyperv/netvsc_drv.c
> b/drivers/net/hyperv/netvsc_drv.c
> index fde1c49..b1dece6 100644
> --- a/drivers/net/hyperv/netvsc_drv.c
> +++ b/drivers/net/hyperv/netvsc_drv.c
> @@ -2671,7 +2671,10 @@ static int netvsc_suspend(struct hv_device *dev)
>
> /* Save the current config info */
> ndev_ctx->saved_netvsc_dev_info = netvsc_devinfo_get(nvdev);
> -
> + if (!ndev_ctx->saved_netvsc_dev_info) {
> + ret = -ENOMEM;
> + goto out;
> + }
> ret = netvsc_detach(net, nvdev);
> out:
> rtnl_unlock();
Reviewed-by: Haiyang Zhang <haiyangz@microsoft.com>
Thank you!
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [PATCH] hv_netvsc: Fix potential dereference of NULL pointer
2022-05-19 12:09 [PATCH] hv_netvsc: Fix potential dereference of NULL pointer Yongzhi Liu
2022-05-19 13:45 ` Haiyang Zhang
@ 2022-05-21 1:00 ` patchwork-bot+netdevbpf
1 sibling, 0 replies; 3+ messages in thread
From: patchwork-bot+netdevbpf @ 2022-05-21 1:00 UTC (permalink / raw)
To: =?utf-8?b?5YiY5rC45b+XIDxseXpfY3NAcGt1LmVkdS5jbj4=?=
Cc: kys, haiyangz, sthemmin, wei.liu, decui, davem, kuba, pabeni,
sashal, linux-hyperv, netdev, linux-kernel, fuyq
Hello:
This patch was applied to netdev/net.git (master)
by Jakub Kicinski <kuba@kernel.org>:
On Thu, 19 May 2022 05:09:48 -0700 you wrote:
> The return value of netvsc_devinfo_get()
> needs to be checked to avoid use of NULL
> pointer in case of an allocation failure.
>
> Fixes: 0efeea5fb ("hv_netvsc: Add the support of hibernation")
>
> Signed-off-by: Yongzhi Liu <lyz_cs@pku.edu.cn>
>
> [...]
Here is the summary with links:
- hv_netvsc: Fix potential dereference of NULL pointer
https://git.kernel.org/netdev/net/c/eb4c07889647
You are awesome, thank you!
--
Deet-doot-dot, I am a bot.
https://korg.docs.kernel.org/patchwork/pwbot.html
^ permalink raw reply [flat|nested] 3+ messages in thread
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2022-05-19 12:09 [PATCH] hv_netvsc: Fix potential dereference of NULL pointer Yongzhi Liu
2022-05-19 13:45 ` Haiyang Zhang
2022-05-21 1:00 ` patchwork-bot+netdevbpf
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