4.19-stable review patch. If anyone has any objections, please let me know.
------------------
From: Vasiliy Kovalev <kovalev@xxxxxxxxxxxx>
commit e606e4b71798cc1df20e987dde2468e9527bd376 upstream.
The changes are similar to those given in the commit 19b070fefd0d
("VMCI: Fix memcpy() run-time warning in dg_dispatch_as_host()").
Fix filling of the msg and msg_payload in dg_info struct, which prevents a
possible "detected field-spanning write" of memcpy warning that is issued
by the tracking mechanism __fortify_memcpy_chk.
Signed-off-by: Vasiliy Kovalev <kovalev@xxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20240219105315.76955-1-kovalev@xxxxxxxxxxxx
Signed-off-by: Kees Cook <keescook@xxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/misc/vmw_vmci/vmci_datagram.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
--- a/drivers/misc/vmw_vmci/vmci_datagram.c
+++ b/drivers/misc/vmw_vmci/vmci_datagram.c
@@ -386,7 +386,8 @@ int vmci_datagram_invoke_guest_handler(s
dg_info->in_dg_host_queue = false;
dg_info->entry = dst_entry;
- memcpy(&dg_info->msg, dg, VMCI_DG_SIZE(dg));
+ dg_info->msg = *dg;
+ memcpy(&dg_info->msg_payload, dg + 1, dg->payload_size);
INIT_WORK(&dg_info->work, dg_delayed_dispatch);
schedule_work(&dg_info->work);
