util: avoid divide by zero FPE

[elogind.git] / src / shared / util.c

diff --git a/src/shared/util.c b/src/shared/util.c
index 2d4a4c1102bd2f082c247f2c38dc27e873321210..9a45e6058e200813fed1bae7ff9d27f0ebb164a5 100644 (file)
--- a/src/shared/util.c
+++ b/src/shared/util.c
@@ -148,6 +148,10 @@ usec_t timespec_load(const struct timespec *ts) {
             ts->tv_nsec == (long) -1)
                 return (usec_t) -1;
 
+        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
                 (usec_t) ts->tv_sec * USEC_PER_SEC +
                 (usec_t) ts->tv_nsec / NSEC_PER_USEC;
@@ -175,6 +179,9 @@ usec_t timeval_load(const struct timeval *tv) {
             tv->tv_usec == (suseconds_t) -1)
                 return (usec_t) -1;
 
+        if (USEC_PER_SEC > (UINT64_MAX - tv->tv_usec) / (usec_t) tv->tv_sec)
+                return (usec_t) -1;
+
         return
                 (usec_t) tv->tv_sec * USEC_PER_SEC +
                 (usec_t) tv->tv_usec;