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hv_netvsc: Fix dereference of nvdev before check 

Passes static analysis by Smatch.

Signed-off-by: Andrew Schwartzmeyer <andschwa@microsoft.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Andrew Schwartzmeyer 2015-08-18 20:06:32 -07:00 committed by David S. Miller
parent 2d79849903
commit 954591b9f3
1 changed files with 5 additions and 2 deletions
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7
drivers/net/hyperv/netvsc_drv.c
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@ -777,14 +777,17 @@ static int netvsc_set_channels(struct net_device *net,
struct hv_device *dev = net_device_ctx->device_ctx;
struct netvsc_device *nvdev = hv_get_drvdata(dev);
struct netvsc_device_info device_info;
const u32 num_chn = nvdev->num_chn;
const u32 max_chn = min_t(u32, nvdev->max_chn, num_online_cpus());
u32 num_chn;
u32 max_chn;
int ret = 0;
bool recovering = false;
if (!nvdev || nvdev->destroy)
return -ENODEV;
num_chn = nvdev->num_chn;
max_chn = min_t(u32, nvdev->max_chn, num_online_cpus());
if (nvdev->nvsp_version < NVSP_PROTOCOL_VERSION_5) {
pr_info("vRSS unsupported before NVSP Version 5\n");
return -EINVAL;