This is a note to let you know that I've just added the patch titled Drivers: hv: kvp: Fix the recent regression caused by incorrect clean-up to the 4.19-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: drivers-hv-kvp-fix-the-recent-regression-caused-by-i.patch and it can be found in the queue-4.19 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. commit 6cca6859c393146dba00a508586272fa9cfc1e7f Author: Dexuan Cui <decui@xxxxxxxxxxxxx> Date: Thu Oct 18 05:09:30 2018 +0000 Drivers: hv: kvp: Fix the recent regression caused by incorrect clean-up [ Upstream commit e670de54c813b5bc3672dd1c67871dc60e9206f4 ] In kvp_send_key(), we do need call process_ib_ipinfo() if message->kvp_hdr.operation is KVP_OP_GET_IP_INFO, because it turns out the userland hv_kvp_daemon needs the info of operation, adapter_id and addr_family. With the incorrect fc62c3b1977d, the host can't get the VM's IP via KVP. And, fc62c3b1977d added a "break;", but actually forgot to initialize the key_size/value in the case of KVP_OP_SET, so the default key_size of 0 is passed to the kvp daemon, and the pool files /var/lib/hyperv/.kvp_pool_* can't be updated. This patch effectively rolls back the previous fc62c3b1977d, and correctly fixes the "this statement may fall through" warnings. This patch is tested on WS 2012 R2 and 2016. Fixes: fc62c3b1977d ("Drivers: hv: kvp: Fix two "this statement may fall through" warnings") Signed-off-by: Dexuan Cui <decui@xxxxxxxxxxxxx> Cc: K. Y. Srinivasan <kys@xxxxxxxxxxxxx> Cc: Stephen Hemminger <sthemmin@xxxxxxxxxxxxx> Signed-off-by: Haiyang Zhang <haiyangz@xxxxxxxxxxxxx> Cc: <Stable@xxxxxxxxxxxxxxx> Signed-off-by: K. Y. Srinivasan <kys@xxxxxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> diff --git a/drivers/hv/hv_kvp.c b/drivers/hv/hv_kvp.c index a7513a8a8e372..d6106e1a0d4af 100644 --- a/drivers/hv/hv_kvp.c +++ b/drivers/hv/hv_kvp.c @@ -353,6 +353,9 @@ static void process_ib_ipinfo(void *in_msg, void *out_msg, int op) out->body.kvp_ip_val.dhcp_enabled = in->kvp_ip_val.dhcp_enabled; + /* fallthrough */ + + case KVP_OP_GET_IP_INFO: utf16s_to_utf8s((wchar_t *)in->kvp_ip_val.adapter_id, MAX_ADAPTER_ID_SIZE, UTF16_LITTLE_ENDIAN, @@ -405,7 +408,11 @@ kvp_send_key(struct work_struct *dummy) process_ib_ipinfo(in_msg, message, KVP_OP_SET_IP_INFO); break; case KVP_OP_GET_IP_INFO: - /* We only need to pass on message->kvp_hdr.operation. */ + /* + * We only need to pass on the info of operation, adapter_id + * and addr_family to the userland kvp daemon. + */ + process_ib_ipinfo(in_msg, message, KVP_OP_GET_IP_INFO); break; case KVP_OP_SET: switch (in_msg->body.kvp_set.data.value_type) { @@ -446,9 +453,9 @@ kvp_send_key(struct work_struct *dummy) } - break; - - case KVP_OP_GET: + /* + * The key is always a string - utf16 encoding. + */ message->body.kvp_set.data.key_size = utf16s_to_utf8s( (wchar_t *)in_msg->body.kvp_set.data.key, @@ -456,6 +463,17 @@ kvp_send_key(struct work_struct *dummy) UTF16_LITTLE_ENDIAN, message->body.kvp_set.data.key, HV_KVP_EXCHANGE_MAX_KEY_SIZE - 1) + 1; + + break; + + case KVP_OP_GET: + message->body.kvp_get.data.key_size = + utf16s_to_utf8s( + (wchar_t *)in_msg->body.kvp_get.data.key, + in_msg->body.kvp_get.data.key_size, + UTF16_LITTLE_ENDIAN, + message->body.kvp_get.data.key, + HV_KVP_EXCHANGE_MAX_KEY_SIZE - 1) + 1; break; case KVP_OP_DELETE: