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hv_netvsc: Fix potential dereference of NULL pointer

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[ Upstream commit eb4c0788964730d12e8dd520bd8f5217ca48321c ]

The return value of netvsc_devinfo_get()
needs to be checked to avoid use of NULL
pointer in case of an allocation failure.

Fixes: 0efeea5fb1 ("hv_netvsc: Add the support of hibernation")
Signed-off-by: Yongzhi Liu <lyz_cs@pku.edu.cn>
Reviewed-by: Haiyang Zhang <haiyangz@microsoft.com>
Link: https://lore.kernel.org/r/1652962188-129281-1-git-send-email-lyz_cs@pku.edu.cn
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Yongzhi Liu
2022-05-19 05:09:48 -07:00
committed by Greg Kroah-Hartman
parent deb16df525
commit 541224201e
1 changed files with 4 additions and 1 deletions
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5
drivers/net/hyperv/netvsc_drv.c
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@@ -2629,7 +2629,10 @@ static int netvsc_suspend(struct hv_device *dev)
/* Save the current config info */ /* Save the current config info */
ndev_ctx->saved_netvsc_dev_info = netvsc_devinfo_get(nvdev); 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); ret = netvsc_detach(net, nvdev);
out: out:
rtnl_unlock(); rtnl_unlock();