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| author | Jason Wang <jasowang@redhat.com> | 2019-05-09 06:20:18 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-05-16 20:41:30 +0300 |
| commit | 17d8a9ebaa99752c7255959dada39dbb4d58a29c (patch) | |
| tree | 912d65179176ab3fb6dd42a866986d52ee970644 /drivers/isdn | |
| parent | 9c79732f98a8dc7aa246be411ebbd28fbdea1fec (diff) | |
| download | linux-17d8a9ebaa99752c7255959dada39dbb4d58a29c.tar.xz | |
tuntap: synchronize through tfiles array instead of tun->numqueues
[ Upstream commit 9871a9e47a2646fe30ae7fd2e67668a8d30912f6 ]
When a queue(tfile) is detached through __tun_detach(), we move the
last enabled tfile to the position where detached one sit but don't
NULL out last position. We expect to synchronize the datapath through
tun->numqueues. Unfortunately, this won't work since we're lacking
sufficient mechanism to order or synchronize the access to
tun->numqueues.
To fix this, NULL out the last position during detaching and check
RCU protected tfile against NULL instead of checking tun->numqueues in
datapath.
Cc: YueHaibing <yuehaibing@huawei.com>
Cc: Cong Wang <xiyou.wangcong@gmail.com>
Cc: weiyongjun (A) <weiyongjun1@huawei.com>
Cc: Eric Dumazet <eric.dumazet@gmail.com>
Fixes: c8d68e6be1c3b ("tuntap: multiqueue support")
Signed-off-by: Jason Wang <jasowang@redhat.com>
Reviewed-by: Wei Yongjun <weiyongjun1@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/isdn')
0 files changed, 0 insertions, 0 deletions