time: adjtimex: Validate the ADJ_FREQUENCY values

[pandora-kernel.git] / kernel / time / ntp.c

diff --git a/kernel/time/ntp.c b/kernel/time/ntp.c
index 87a346f..28bf91c 100644 (file)
--- a/kernel/time/ntp.c
+++ b/kernel/time/ntp.c
@@ -633,6 +633,13 @@ int ntp_validate_timex(struct timex *txc)
        if ((txc->modes & ADJ_SETOFFSET) && (!capable(CAP_SYS_TIME)))
                return -EPERM;
 
+       if (txc->modes & ADJ_FREQUENCY) {
+               if (LONG_MIN / PPM_SCALE > txc->freq)
+                       return -EINVAL;
+               if (LONG_MAX / PPM_SCALE < txc->freq)
+                       return -EINVAL;
+       }
+
        return 0;
 }