[klibc] [klibc:time64] select: Fix handling of NULL timeout when wrapping pselect()

[klibc-bot for Ben Hutchings]

Commit-ID:  fcbb80e223c369467680536b71c781918e614219
Gitweb:     http://git.kernel.org/?p=libs/klibc/klibc.git;a=commit;h=fcbb80e223c369467680536b71c781918e614219
Author:     Ben Hutchings <ben at decadent.org.uk>
AuthorDate: Sat, 14 Jan 2023 03:43:16 +0100
Committer:  Ben Hutchings <ben at decadent.org.uk>
CommitDate: Sun, 15 Jan 2023 21:28:18 +0100

[klibc] select: Fix handling of NULL timeout when wrapping pselect()

If select() is called with no timeout, our implementation wrapping
pselect() passes an uninitialised timespec buffer to pselect().  It
should pass NULL.

Signed-off-by: Ben Hutchings <ben at decadent.org.uk>

---
 usr/klibc/select.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/usr/klibc/select.c b/usr/klibc/select.c
index 7af28fee..8ad93a4b 100644
--- a/usr/klibc/select.c
+++ b/usr/klibc/select.c
@@ -21,7 +21,8 @@ int select(int nfds, fd_set *readfds, fd_set *writefds,
 		ts.tv_nsec = timeout->tv_usec * 1000;
 	}
 
-	result = __pselect6(nfds, readfds, writefds, exceptfds, &ts, NULL);
+	result = __pselect6(nfds, readfds, writefds, exceptfds,
+			    timeout ? &ts : NULL, NULL);
 
 	if (timeout) {
 		timeout->tv_sec = ts.tv_sec;