[PATCH for-5.2] util/cutils: Fix bounds check at freq_to_str()

[Eduardo Habkost]

Fix bounds check for idx at freq_to_str(), to actually ensure idx
never goes beyond the last element of the suffixes array.

Reported-by: Coverity (CID 1435957: OVERRUN)
Suggested-by: Peter Maydell <peter.mayd...@linaro.org>
Signed-off-by: Eduardo Habkost <ehabk...@redhat.com>
---
 util/cutils.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/util/cutils.c b/util/cutils.c
index c395974fab..0d9261e1e5 100644
--- a/util/cutils.c
+++ b/util/cutils.c
@@ -891,7 +891,7 @@ char *freq_to_str(uint64_t freq_hz)
     double freq = freq_hz;
     size_t idx = 0;
 
-    while (freq >= 1000.0 && idx < ARRAY_SIZE(suffixes)) {
+    while (freq >= 1000.0 && idx < ARRAY_SIZE(suffixes) - 1) {
         freq /= 1000.0;
         idx++;
     }
-- 
2.28.0