From c763173b9ab87b7413e63a82be88987250677b89 Mon Sep 17 00:00:00 2001 From: Sasha Levin Date: Thu, 15 Mar 2012 12:36:14 -0400 Subject: [PATCH 042/147] ntp: Fix integer overflow when setting time commit a078c6d0e6288fad6d83fb6d5edd91ddb7b6ab33 upstream. 'long secs' is passed as divisor to div_s64, which accepts a 32bit divisor. On 64bit machines that value is trimmed back from 8 bytes back to 4, causing a divide by zero when the number is bigger than (1 << 32) - 1 and all 32 lower bits are 0. Use div64_long() instead. Signed-off-by: Sasha Levin Cc: johnstul@us.ibm.com Link: http://lkml.kernel.org/r/1331829374-31543-2-git-send-email-levinsasha928@gmail.com Signed-off-by: Thomas Gleixner Signed-off-by: Greg Kroah-Hartman --- kernel/time/ntp.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/kernel/time/ntp.c b/kernel/time/ntp.c index f6117a4..4b85a7a 100644 --- a/kernel/time/ntp.c +++ b/kernel/time/ntp.c @@ -275,7 +275,7 @@ static inline s64 ntp_update_offset_fll(s64 offset64, long secs) time_status |= STA_MODE; - return div_s64(offset64 << (NTP_SCALE_SHIFT - SHIFT_FLL), secs); + return div64_long(offset64 << (NTP_SCALE_SHIFT - SHIFT_FLL), secs); } static void ntp_update_offset(long offset) -- 1.7.9.4