hv_netvsc: Fix accessing freed memory in netvsc_change_mtu()
struct netvsc_device is freed in rndis_filter_device_remove(). So we save
the nvdev->num_chn into a temp variable for later usage.
(Please also include this patch into stable branch.)
Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com>
Reviewed-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/hyperv/netvsc_drv.c b/drivers/net/hyperv/netvsc_drv.c
index 0860849..b8121eb 100644
--- a/drivers/net/hyperv/netvsc_drv.c
+++ b/drivers/net/hyperv/netvsc_drv.c
@@ -858,6 +858,7 @@
struct netvsc_device *nvdev = hv_get_drvdata(hdev);
struct netvsc_device_info device_info;
int limit = ETH_DATA_LEN;
+ u32 num_chn;
int ret = 0;
if (nvdev == NULL || nvdev->destroy)
@@ -873,6 +874,8 @@
if (ret)
goto out;
+ num_chn = nvdev->num_chn;
+
nvdev->start_remove = true;
rndis_filter_device_remove(hdev);
@@ -883,7 +886,7 @@
memset(&device_info, 0, sizeof(device_info));
device_info.ring_size = ring_size;
- device_info.num_chn = nvdev->num_chn;
+ device_info.num_chn = num_chn;
device_info.max_num_vrss_chns = max_num_vrss_chns;
rndis_filter_device_add(hdev, &device_info);