[coreboot-gerrit] Change in ...coreboot[master]: util/romcc: Prevent out-of-bounds read

[Jacob Garber (Code Review)]

Jacob Garber has uploaded this change for review. ( https://review.coreboot.org/c/coreboot/+/32902

Change subject: util/romcc: Prevent out-of-bounds read
......................................................................

util/romcc: Prevent out-of-bounds read

If 'class > LAST_REGC', then there will be an out-of-bounds read when
accessing 'regcm_bound'. Prevent this by skipping to the next iteration
of the loop. Note that this should not generally happen anyway, since
'result' represents a bitset for the indices of 'regcm_bound', and so
iterations where 'class > LAST_REGC' should already be skipped by the
previous continue statement (since those bits of 'result' should all be
zero).

Found-by: Covericy CID 1129122
Signed-off-by: Jacob Garber 
Change-Id: Id5f5adb0a292763251054aeecf2a5b87a11297b1
---
M util/romcc/romcc.c
1 file changed, 1 insertion(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/02/32902/1

diff --git a/util/romcc/romcc.c b/util/romcc/romcc.c
index c6507dc..aefd7c5 100644
--- a/util/romcc/romcc.c
+++ b/util/romcc/romcc.c
@@ -22150,6 +22150,7 @@
    	}
    	if (class > LAST_REGC) {
    		result &= ~mask;
+			continue;
    	}
    	for(class2 = 0; class2 <= LAST_REGC; class2++) {
    		if ((regcm_bound[class2].first >= regcm_bound[class].first) &&