Mercurial > dovecot > original-hg > dovecot-1.2
changeset 8503:16ca1b36e6c3 HEAD
Avoid integer overflows when calculating with very large timeout values.
author | Timo Sirainen <tss@iki.fi> |
---|---|
date | Sun, 30 Nov 2008 04:20:18 +0200 |
parents | 570927dfc769 |
children | 2297a352dfd3 |
files | src/lib/ioloop.c |
diffstat | 1 files changed, 9 insertions(+), 4 deletions(-) [+] |
line wrap: on
line diff
--- a/src/lib/ioloop.c Sun Nov 30 04:03:20 2008 +0200 +++ b/src/lib/ioloop.c Sun Nov 30 04:20:18 2008 +0200 @@ -190,6 +190,8 @@ tv_r->tv_sec = tv_now->tv_sec; tv_r->tv_usec = tv_now->tv_usec; } + i_assert(tv_r->tv_sec > 0); + i_assert(timeout->next_run.tv_sec > 0); tv_r->tv_sec = timeout->next_run.tv_sec - tv_r->tv_sec; tv_r->tv_usec = timeout->next_run.tv_usec - tv_r->tv_usec; @@ -198,14 +200,17 @@ tv_r->tv_usec += 1000000; } - /* round wait times up to next millisecond */ - ret = tv_r->tv_sec * 1000 + (tv_r->tv_usec + 999) / 1000; - if (ret <= 0) { + if (tv_r->tv_sec < 0 || (tv_r->tv_sec == 0 && tv_r->tv_usec < 1000)) { tv_r->tv_sec = 0; tv_r->tv_usec = 0; return 0; } - i_assert(tv_r->tv_sec >= 0 && tv_r->tv_usec >= 0); + if (tv_r->tv_sec > INT_MAX/1000-1) + tv_r->tv_sec = INT_MAX/1000-1; + + /* round wait times up to next millisecond */ + ret = tv_r->tv_sec * 1000 + (tv_r->tv_usec + 999) / 1000; + i_assert(ret > 0 && tv_r->tv_sec >= 0 && tv_r->tv_usec >= 0); return ret; }