diff options
Diffstat (limited to 'kernel/time/ntp.c')
| -rw-r--r-- | kernel/time/ntp.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/kernel/time/ntp.c b/kernel/time/ntp.c index d6132cde9ba3..0cc6c9fe9416 100644 --- a/kernel/time/ntp.c +++ b/kernel/time/ntp.c @@ -671,6 +671,17 @@ int ntp_validate_timex(struct timex *txc) if ((txc->modes & ADJ_SETOFFSET) && (!capable(CAP_SYS_TIME))) return -EPERM; + /* + * 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 (LLONG_MAX / PPM_SCALE < txc->freq) + return -EINVAL; + } + return 0; } |