netfilter: xt_time gives a wrong monthday in a leap year

The function localtime_3 in xt_time.c gives a wrong monthday in a leap
year after 28th 2.  calculating monthday should use the array
days_since_leapyear[] not days_since_year[] in a leap year.

Signed-off-by: Kaihui Luo <kaih.luo@gmail.com>
Acked-by: Jan Engelhardt <jengelh@computergmbh.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 4 insertions, 2 deletions

diff --git a/net/netfilter/xt_time.c b/net/netfilter/xt_time.c
index 9f328593287e..307a2c3c2df4 100644
--- a/net/netfilter/xt_time.c
+++ b/net/netfilter/xt_time.c
@@ -136,17 +136,19 @@ static void localtime_3(struct xtm *r, time_t time)
          * from w repeatedly while counting.)
          */
         if (is_leap(year)) {
+                /* use days_since_leapyear[] in a leap year */
                 for (i = ARRAY_SIZE(days_since_leapyear) - 1;
-                    i > 0 && days_since_year[i] > w; --i)
+                    i > 0 && days_since_leapyear[i] > w; --i)
                         /* just loop */;
+                r->monthday = w - days_since_leapyear[i] + 1;
         } else {
                 for (i = ARRAY_SIZE(days_since_year) - 1;
                     i > 0 && days_since_year[i] > w; --i)
                         /* just loop */;
+                r->monthday = w - days_since_year[i] + 1;
         }
 
         r->month    = i + 1;
-        r->monthday = w - days_since_year[i] + 1;
         return;
 }