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netvsc: use RCU to protect inner device structure

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The netvsc driver has an internal structure (netvsc_device) which
is created when device is opened and released when device is closed.
And also opened/released when MTU or number of channels change.

Since this is referenced in the receive and transmit path, it is
safer to use RCU to protect/prevent use after free problems.

Signed-off-by: Stephen Hemminger <sthemmin@microsoft.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
stephen hemminger
2017-03-22 14:51:00 -07:00
committed by David S. Miller
parent 3071ada491
commit 545a8e79bd
3 changed files with 57 additions and 24 deletions
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4
drivers/net/hyperv/hyperv_net.h
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@@ -686,7 +686,7 @@ struct net_device_context {
/* point back to our device context */
struct hv_device *device_ctx;
/* netvsc_device */
struct netvsc_device *nvdev;
struct netvsc_device __rcu *nvdev;
/* reconfigure work */
struct delayed_work dwork;
/* last reconfig time */
@@ -780,6 +780,8 @@ struct netvsc_device {
atomic_t open_cnt;
struct netvsc_channel chan_table[VRSS_CHANNEL_MAX];
struct rcu_head rcu;
};
static inline struct netvsc_device *