1 files changed, 11 insertions, 4 deletions

diff --git a/fs/select.c b/fs/select.c
index 8084834e123e..fd38ce2e32e3 100644
--- a/fs/select.c
+++ b/fs/select.c
@@ -15,6 +15,7 @@
  */
 
 #include <linux/kernel.h>
+#include <linux/sched.h>
 #include <linux/syscalls.h>
 #include <linux/module.h>
 #include <linux/slab.h>
@@ -41,22 +42,28 @@
  * better solutions..
  */
 
+#define MAX_SLACK       (100 * NSEC_PER_MSEC)
+
 static long __estimate_accuracy(struct timespec *tv)
 {
         long slack;
         int divfactor = 1000;
 
+        if (tv->tv_sec < 0)
+                return 0;
+
         if (task_nice(current) > 0)
                 divfactor = divfactor / 5;
 
+        if (tv->tv_sec > MAX_SLACK / (NSEC_PER_SEC/divfactor))
+                return MAX_SLACK;
+
         slack = tv->tv_nsec / divfactor;
         slack += tv->tv_sec * (NSEC_PER_SEC/divfactor);
 
-        if (slack > 100 * NSEC_PER_MSEC)
-                slack =  100 * NSEC_PER_MSEC;
+        if (slack > MAX_SLACK)
+                return MAX_SLACK;
 
-        if (slack < 0)
-                slack = 0;
         return slack;
 }