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| author | Dexuan Cui <decui@microsoft.com> | 2020-01-19 15:29:22 -0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-08-11 15:33:38 +0200 |
| commit | 6059000e145feb0c0399717f34a70b8d74fe030d (patch) | |
| tree | 0d44592018b4028aa45ea73ee3b8fc28cc8f2719 /drivers/hv | |
| parent | 3429579045f1e867c5edb10ec0060a85a7bb651e (diff) | |
| download | linux-stable-6059000e145feb0c0399717f34a70b8d74fe030d.tar.gz linux-stable-6059000e145feb0c0399717f34a70b8d74fe030d.tar.bz2 linux-stable-6059000e145feb0c0399717f34a70b8d74fe030d.zip | |
Drivers: hv: vmbus: Ignore CHANNELMSG_TL_CONNECT_RESULT(23)
[ Upstream commit ddc9d357b991838c2d975e8d7e4e9db26f37a7ff ]
When a Linux hv_sock app tries to connect to a Service GUID on which no
host app is listening, a recent host (RS3+) sends a
CHANNELMSG_TL_CONNECT_RESULT (23) message to Linux and this triggers such
a warning:
unknown msgtype=23
WARNING: CPU: 2 PID: 0 at drivers/hv/vmbus_drv.c:1031 vmbus_on_msg_dpc
Actually Linux can safely ignore the message because the Linux app's
connect() will time out in 2 seconds: see VSOCK_DEFAULT_CONNECT_TIMEOUT
and vsock_stream_connect(). We don't bother to make use of the message
because: 1) it's only supported on recent hosts; 2) a non-trivial effort
is required to use the message in Linux, but the benefit is small.
So, let's not see the warning by silently ignoring the message.
Signed-off-by: Dexuan Cui <decui@microsoft.com>
Reviewed-by: Michael Kelley <mikelley@microsoft.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'drivers/hv')
| -rw-r--r-- | drivers/hv/channel_mgmt.c | 21 | ||||
| -rw-r--r-- | drivers/hv/vmbus_drv.c | 4 |
2 files changed, 11 insertions, 14 deletions
diff --git a/drivers/hv/channel_mgmt.c b/drivers/hv/channel_mgmt.c index c8296d5e74c3..501c43c5851d 100644 --- a/drivers/hv/channel_mgmt.c +++ b/drivers/hv/channel_mgmt.c @@ -1354,6 +1354,8 @@ channel_message_table[CHANNELMSG_COUNT] = { { CHANNELMSG_19, 0, NULL }, { CHANNELMSG_20, 0, NULL }, { CHANNELMSG_TL_CONNECT_REQUEST, 0, NULL }, + { CHANNELMSG_22, 0, NULL }, + { CHANNELMSG_TL_CONNECT_RESULT, 0, NULL }, }; /* @@ -1365,25 +1367,16 @@ void vmbus_onmessage(void *context) { struct hv_message *msg = context; struct vmbus_channel_message_header *hdr; - int size; hdr = (struct vmbus_channel_message_header *)msg->u.payload; - size = msg->header.payload_size; trace_vmbus_on_message(hdr); - if (hdr->msgtype >= CHANNELMSG_COUNT) { - pr_err("Received invalid channel message type %d size %d\n", - hdr->msgtype, size); - print_hex_dump_bytes("", DUMP_PREFIX_NONE, - (unsigned char *)msg->u.payload, size); - return; - } - - if (channel_message_table[hdr->msgtype].message_handler) - channel_message_table[hdr->msgtype].message_handler(hdr); - else - pr_err("Unhandled channel message type %d\n", hdr->msgtype); + /* + * vmbus_on_msg_dpc() makes sure the hdr->msgtype here can not go + * out of bound and the message_handler pointer can not be NULL. + */ + channel_message_table[hdr->msgtype].message_handler(hdr); } /* diff --git a/drivers/hv/vmbus_drv.c b/drivers/hv/vmbus_drv.c index 160ff640485b..24c38e44ed3b 100644 --- a/drivers/hv/vmbus_drv.c +++ b/drivers/hv/vmbus_drv.c @@ -1073,6 +1073,10 @@ void vmbus_on_msg_dpc(unsigned long data) } entry = &channel_message_table[hdr->msgtype]; + + if (!entry->message_handler) + goto msg_handled; + if (entry->handler_type == VMHT_BLOCKING) { ctx = kmalloc(sizeof(*ctx), GFP_ATOMIC); if (ctx == NULL) |