[coreboot-gerrit] Change in coreboot[master]: soc/intel/skylake: ME status value is over status array boundary

[Kane Chen (Code Review)]

Kane Chen has uploaded this change for review. ( https://review.coreboot.org/25425

Change subject: soc/intel/skylake: ME status value is over status array boundary
......................................................................

soc/intel/skylake: ME status value is over status array boundary

me_progress_rom_values array provides detailed information maps to
ME HFSTS2 register value.
There is a chance that ME status value might be over the size of
me_progress_rom_values.
This commit adds a check before access the array.

BUG=b:77247550

Change-Id: I5de569c62b94b0595d3d3ea254f50e312e8c11a4
Signed-off-by: Kane Chen 
---
M src/soc/intel/skylake/me.c
1 file changed, 8 insertions(+), 2 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/25/25425/1

diff --git a/src/soc/intel/skylake/me.c b/src/soc/intel/skylake/me.c
index 9a721bc..a23172e 100644
--- a/src/soc/intel/skylake/me.c
+++ b/src/soc/intel/skylake/me.c
@@ -346,8 +346,14 @@
    printk(BIOS_DEBUG, "ME: Progress Phase State    : ");
    switch (hfs2.fields.progress_code) {
    case ME_HFS2_PHASE_ROM:		/* ROM Phase */
-		printk(BIOS_DEBUG, "%s",
-		       me_progress_rom_values[hfs2.fields.current_state]);
+		if (hfs2.fields.current_state
+			< ARRAY_SIZE(me_progress_rom_values)
+		    && me_progress_rom_values[hfs2.fields.current_state])
+			printk(BIOS_DEBUG, "%s",
+			       me_progress_rom_values[
+						hfs2.fields.current_state]);
+		else
+			printk(BIOS_DEBUG, "0x%02x", hfs2.fields.current_state);
    	break;

case ME_HFS2_PHASE_UKERNEL:	/* uKernel Phase */