diff options
| -rw-r--r-- | kernel/time/ntp.c | 10 |
1 files changed, 7 insertions, 3 deletions
diff --git a/kernel/time/ntp.c b/kernel/time/ntp.c index bca743d..34fd01e 100644 --- a/kernel/time/ntp.c +++ b/kernel/time/ntp.c @@ -608,10 +608,14 @@ int do_adjtimex(struct timex *txc) return -EINVAL; } - if (txc->modes & ADJ_FREQUENCY) { - if (LONG_MIN / PPM_SCALE > txc->freq) + /* + * Check for potential multiplication overflows that can + * only happen on 64-bit systems: + */ + if ((txc->modes & ADJ_FREQUENCY) && (BITS_PER_LONG == 64)) { + if (LLONG_MIN / PPM_SCALE > txc->freq) return -EINVAL; - if (LONG_MAX / PPM_SCALE < txc->freq) + if (LLONG_MAX / PPM_SCALE < txc->freq) return -EINVAL; } |