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| author |   david decotigny <decot@googlers.com> | 2014-07-08 15:14:41 -0700 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2014-07-08 20:50:53 -0700 |
| commit | efa95b01da18ad22af62f6d99a3243f3be8fd264 (patch) | |
| tree | c931e08ed3a660e859bdfc1afd1a2ac014485b8a /net/core/netpoll.c | |
| parent | xen-netback: Adding debugfs "io_ring_qX" files (diff) | |
| download | linux-dev-efa95b01da18ad22af62f6d99a3243f3be8fd264.tar.xz linux-dev-efa95b01da18ad22af62f6d99a3243f3be8fd264.zip | |
netpoll: fix use after free
After a bonding master reclaims the netpoll info struct, slaves could
still hold a pointer to the reclaimed data. This patch fixes it: as
soon as netpoll_async_cleanup is called for a slave (eg. when
un-enslaved), we make sure that this slave doesn't point to the data.
Signed-off-by: David Decotigny <decot@googlers.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/core/netpoll.c')
| -rw-r--r-- | net/core/netpoll.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/net/core/netpoll.c b/net/core/netpoll.c index e33937fb32a0..907fb5e36c02 100644 --- a/net/core/netpoll.c +++ b/net/core/netpoll.c @@ -822,7 +822,8 @@ void __netpoll_cleanup(struct netpoll *np) RCU_INIT_POINTER(np->dev->npinfo, NULL); call_rcu_bh(&npinfo->rcu, rcu_cleanup_netpoll_info); - } + } else + RCU_INIT_POINTER(np->dev->npinfo, NULL); } EXPORT_SYMBOL_GPL(__netpoll_cleanup); |