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-rw-r--r--networking/ntpd.c5
1 files changed, 3 insertions, 2 deletions
diff --git a/networking/ntpd.c b/networking/ntpd.c
index 03fe448ca..bf8ef0a89 100644
--- a/networking/ntpd.c
+++ b/networking/ntpd.c
@@ -1660,13 +1660,14 @@ retry_interval(void)
static unsigned
poll_interval(int exponent)
{
- unsigned interval, r;
+ unsigned interval, r, mask;
exponent = G.poll_exp + exponent;
if (exponent < 0)
exponent = 0;
interval = 1 << exponent;
+ mask = ((interval-1) >> 4) | 1;
r = random();
- interval += ((r & (interval-1)) >> 4) + ((r >> 8) & 1); /* + 1/16 of interval, max */
+ interval += r & mask; /* ~ random(0..1) * interval/16 */
VERB4 bb_error_msg("chose poll interval:%u (poll_exp:%d exp:%d)", interval, G.poll_exp, exponent);
return interval;
}