runtime: fix tv_sec 32-bit overflows in sleep routines.
Fixes #5063.
R=golang-dev, minux.ma, rsc
CC=golang-dev
https://golang.org/cl/7876043
diff --git a/src/pkg/runtime/os_darwin.c b/src/pkg/runtime/os_darwin.c
index ba4e6eb..6216e3a 100644
--- a/src/pkg/runtime/os_darwin.c
+++ b/src/pkg/runtime/os_darwin.c
@@ -409,9 +409,14 @@
runtime·mach_semacquire(uint32 sem, int64 ns)
{
int32 r;
+ int64 secs;
if(ns >= 0) {
- r = runtime·mach_semaphore_timedwait(sem, ns/1000000000LL, ns%1000000000LL);
+ secs = ns/1000000000LL;
+ // Avoid overflow
+ if(secs > 1LL<<30)
+ secs = 1LL<<30;
+ r = runtime·mach_semaphore_timedwait(sem, secs, ns%1000000000LL);
if(r == KERN_ABORTED || r == KERN_OPERATION_TIMED_OUT)
return -1;
if(r != 0)
