diff options
| author | Jakub Kicinski <kuba@kernel.org> | 2022-06-23 06:21:05 +0200 |
|---|---|---|
| committer | Jakub Kicinski <kuba@kernel.org> | 2022-06-28 06:48:01 +0200 |
| commit | a8fc8cb5692aebb9c6f7afd4265366d25dcd1d01 (patch) | |
| tree | bc8d41e3129bde5e8b32ece7541095b7b566db47 /drivers/net/tun.c | |
| parent | tipc: move bc link creation back to tipc_node_create (diff) | |
| download | linux-a8fc8cb5692aebb9c6f7afd4265366d25dcd1d01.tar.xz linux-a8fc8cb5692aebb9c6f7afd4265366d25dcd1d01.zip | |
net: tun: stop NAPI when detaching queues
While looking at a syzbot report I noticed the NAPI only gets
disabled before it's deleted. I think that user can detach
the queue before destroying the device and the NAPI will never
be stopped.
Fixes: 943170998b20 ("tun: enable NAPI for TUN/TAP driver")
Acked-by: Petar Penkov <ppenkov@aviatrix.com>
Link: https://lore.kernel.org/r/20220623042105.2274812-1-kuba@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to 'drivers/net/tun.c')
| -rw-r--r-- | drivers/net/tun.c | 11 |
1 files changed, 10 insertions, 1 deletions
diff --git a/drivers/net/tun.c b/drivers/net/tun.c index 7fd0288c3789..e2eb35887394 100644 --- a/drivers/net/tun.c +++ b/drivers/net/tun.c @@ -273,6 +273,12 @@ static void tun_napi_init(struct tun_struct *tun, struct tun_file *tfile, } } +static void tun_napi_enable(struct tun_file *tfile) +{ + if (tfile->napi_enabled) + napi_enable(&tfile->napi); +} + static void tun_napi_disable(struct tun_file *tfile) { if (tfile->napi_enabled) @@ -653,8 +659,10 @@ static void __tun_detach(struct tun_file *tfile, bool clean) if (clean) { RCU_INIT_POINTER(tfile->tun, NULL); sock_put(&tfile->sk); - } else + } else { tun_disable_queue(tun, tfile); + tun_napi_disable(tfile); + } synchronize_net(); tun_flow_delete_by_queue(tun, tun->numqueues + 1); @@ -808,6 +816,7 @@ static int tun_attach(struct tun_struct *tun, struct file *file, if (tfile->detached) { tun_enable_queue(tfile); + tun_napi_enable(tfile); } else { sock_hold(&tfile->sk); tun_napi_init(tun, tfile, napi, napi_frags); |