This is a note to let you know that I've just added the patch titled
Drivers: hv: kvp: Fix two "this statement may fall through" warnings
to my char-misc git tree which can be found at git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc.git in the char-misc-testing branch.
The patch will show up in the next release of the linux-next tree (usually sometime within the next 24 hours during the week.)
The patch will be merged to the char-misc-next branch sometime soon, after it passes testing, and the merge window is open.
If you have any questions about this process, please let me know.
From fc62c3b1977d62e6374fd6e28d371bb42dfa5c9d Mon Sep 17 00:00:00 2001
From: Dexuan Cui decui@microsoft.com Date: Sun, 23 Sep 2018 21:10:43 +0000 Subject: Drivers: hv: kvp: Fix two "this statement may fall through" warnings
We don't need to call process_ib_ipinfo() if message->kvp_hdr.operation is KVP_OP_GET_IP_INFO in kvp_send_key(), because here we just need to pass on the op code from the host to the userspace; when the userspace returns the info requested by the host, we pass the info on to the host in kvp_respond_to_host() -> process_ob_ipinfo(). BTW, the current buggy code actually doesn't cause any harm, because only message->kvp_hdr.operation is used by the userspace, in the case of KVP_OP_GET_IP_INFO.
The patch also adds a missing "break;" in kvp_send_key(). BTW, the current buggy code actually doesn't cause any harm, because in the case of KVP_OP_SET, the unexpected fall-through corrupts message->body.kvp_set.data.key_size, but that is not really used: see the definition of struct hv_kvp_exchg_msg_value.
Signed-off-by: Dexuan Cui decui@microsoft.com Cc: K. Y. Srinivasan kys@microsoft.com Cc: Haiyang Zhang haiyangz@microsoft.com Cc: Stephen Hemminger sthemmin@microsoft.com Cc: Stable@vger.kernel.org Signed-off-by: K. Y. Srinivasan kys@microsoft.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/hv/hv_kvp.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/drivers/hv/hv_kvp.c b/drivers/hv/hv_kvp.c index 023bd185d21a..a7513a8a8e37 100644 --- a/drivers/hv/hv_kvp.c +++ b/drivers/hv/hv_kvp.c @@ -353,7 +353,6 @@ 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;
- default: utf16s_to_utf8s((wchar_t *)in->kvp_ip_val.adapter_id, MAX_ADAPTER_ID_SIZE, UTF16_LITTLE_ENDIAN, @@ -406,7 +405,7 @@ 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: - process_ib_ipinfo(in_msg, message, KVP_OP_GET_IP_INFO); + /* We only need to pass on message->kvp_hdr.operation. */ break; case KVP_OP_SET: switch (in_msg->body.kvp_set.data.value_type) { @@ -446,6 +445,9 @@ kvp_send_key(struct work_struct *dummy) break;
} + + break; + case KVP_OP_GET: message->body.kvp_set.data.key_size = utf16s_to_utf8s(