Commit 11bedb2e authored by Dexuan Cui's avatar Dexuan Cui Committed by Greg Kroah-Hartman

Drivers: hv: kvp: Fix the recent regression caused by incorrect clean-up

[ Upstream commit e670de54 ]

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 fc62c3b1, the host can't get the
VM's IP via KVP.

And, fc62c3b1 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 fc62c3b1, and
correctly fixes the "this statement may fall through" warnings.

This patch is tested on WS 2012 R2 and 2016.

Fixes: fc62c3b1 ("Drivers: hv: kvp: Fix two "this statement may fall through" warnings")
Signed-off-by: default avatarDexuan Cui <decui@microsoft.com>
Cc: K. Y. Srinivasan <kys@microsoft.com>
Cc: Stephen Hemminger <sthemmin@microsoft.com>
Signed-off-by: default avatarHaiyang Zhang <haiyangz@microsoft.com>
Cc: <Stable@vger.kernel.org>
Signed-off-by: default avatarK. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: default avatarSasha Levin <sashal@kernel.org>
parent 74ff2583
......@@ -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:
......
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