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util: avoid divide by zero FPE

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In early userspace, if kernel initialization happens extremely quickly,
a call to systemd-timestamp can potentially result in division by zero.
Ensure that the check in timespec_load, which only makes sense if tv_sec
is greater than zero, is guarded by this condition.
This commit is contained in:
Dave Reisner 2012-10-29 15:49:34 -04:00
parent 6827101ab4
commit 49371bb50e
1 changed files with 2 additions and 1 deletions
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src/shared/util.c
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@ -148,7 +148,8 @@ usec_t timespec_load(const struct timespec *ts) {
ts->tv_nsec == (long) -1)
return (usec_t) -1;
if (USEC_PER_SEC > ((UINT64_MAX - (ts->tv_nsec / NSEC_PER_USEC)) / (usec_t) ts->tv_sec))
if (ts->tv_sec > 0 &&
USEC_PER_SEC > ((UINT64_MAX - (ts->tv_nsec / NSEC_PER_USEC)) / (usec_t) ts->tv_sec))
return (usec_t) -1;
return