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-rw-r--r--misc/pselect.c14
1 files changed, 12 insertions, 2 deletions
diff --git a/misc/pselect.c b/misc/pselect.c
index 80cf8be4b3..e29d7b36ad 100644
--- a/misc/pselect.c
+++ b/misc/pselect.c
@@ -1,4 +1,4 @@
-/* Copyright (C) 1996-1998,2001,2002,2003,2006 Free Software Foundation, Inc.
+/* Copyright (C) 1996-1998,2001-2003,2006,2011 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@cygnus.com>, 1996.
@@ -43,7 +43,17 @@ __pselect (int nfds, fd_set *readfds, fd_set *writefds, fd_set *exceptfds,
precision and therefore the `pselect` should be available. But
for now it is hardly found. */
if (timeout != NULL)
- TIMESPEC_TO_TIMEVAL (&tval, timeout);
+ {
+ /* Catch bugs which would be hidden by the TIMESPEC_TO_TIMEVAL
+ computations. The division by 1000 truncates values. */
+ if (__builtin_expect (timeout->tv_nsec < 0, 0))
+ {
+ __set_errno (EINVAL);
+ return -1;
+ }
+
+ TIMESPEC_TO_TIMEVAL (&tval, timeout);
+ }
/* The setting and restoring of the signal mask and the select call
should be an atomic operation. This can't be done without kernel