From: Sasha Levin Date: Thu, 15 Mar 2012 16:36:14 +0000 (-0400) Subject: ntp: Fix integer overflow when setting time X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=a078c6d0e6288fad6d83fb6d5edd91ddb7b6ab33;p=GitHub%2Fmt8127%2Fandroid_kernel_alcatel_ttab.git ntp: Fix integer overflow when setting time '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 Cc: stable@vger.kernel.org Signed-off-by: Thomas Gleixner --- diff --git a/kernel/time/ntp.c b/kernel/time/ntp.c index 17fb1b9807d0..6e039b144daf 100644 --- a/kernel/time/ntp.c +++ b/kernel/time/ntp.c @@ -289,7 +289,7 @@ 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)