[XS] Change in coreboot[main]: drivers/soc/cse: Fix overflow in CSE telemetry calculation

[Subrata Banik (Code Review)]

Subrata Banik has submitted this change. ( https://review.coreboot.org/c/coreboot/+/86215?usp=email )

Change subject: drivers/soc/cse: Fix overflow in CSE telemetry calculation
......................................................................

drivers/soc/cse: Fix overflow in CSE telemetry calculation

MSEC_TO_USEC(cse_perf_data.timestamp[i]) does overflow.
Here is an example, if cse_perf_data.timestamp[i] value is
4304903 milliseconds. When multiplied by 1000 to convert to
microseconds, the value becomes 0x979B58 instead of 0x100979B58.

TEST=Boot to OS

Change-Id: I09cc00aa595a821a57a34c38a4435e433e935ad3
Signed-off-by: Bora Guvendik 
Reviewed-on: https://review.coreboot.org/c/coreboot/+/86215
Reviewed-by: Subrata Banik 
Reviewed-by: Kapil Porwal 
Tested-by: build bot (Jenkins) 
Reviewed-by: Jérémy Compostella 
---
M src/soc/intel/common/block/cse/telemetry.c
1 file changed, 1 insertion(+), 1 deletion(-)

Approvals:
  build bot (Jenkins): Verified
  Kapil Porwal: Looks good to me, approved
  Jérémy Compostella: Looks good to me, but someone else must approve
  Subrata Banik: Looks good to me, approved

diff --git a/src/soc/intel/common/block/cse/telemetry.c b/src/soc/intel/common/block/cse/telemetry.c
index 2c9fb54..62814eb 100644
--- a/src/soc/intel/common/block/cse/telemetry.c
+++ b/src/soc/intel/common/block/cse/telemetry.c
@@ -4,7 +4,7 @@
 #include <intelblocks/cse.h>
 #include <timestamp.h>

-#define MSEC_TO_USEC(x) (x * 1000)
+#define MSEC_TO_USEC(x) ((s64)x * 1000)

enum cb_err cse_get_boot_performance_data(struct cse_boot_perf_rsp *boot_perf_rsp)
 {