From eb4c0788964730d12e8dd520bd8f5217ca48321c Mon Sep 17 00:00:00 2001 From: Yongzhi Liu Date: Thu, 19 May 2022 05:09:48 -0700 Subject: [PATCH] hv_netvsc: Fix potential dereference of NULL pointer The return value of netvsc_devinfo_get() needs to be checked to avoid use of NULL pointer in case of an allocation failure. Fixes: 0efeea5fb153 ("hv_netvsc: Add the support of hibernation") Signed-off-by: Yongzhi Liu Reviewed-by: Haiyang Zhang Link: https://lore.kernel.org/r/1652962188-129281-1-git-send-email-lyz_cs@pku.edu.cn Signed-off-by: Jakub Kicinski --- 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 fde1c492ca02..b1dece6b9698 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();