in clock_getres, check for null pointer before storing result

POSIX allows a null pointer, in which case the function only checks
the validity of the clock id argument.

diff --git a/src/time/clock_getres.c b/src/time/clock_getres.c
index f0f41cf9ec0aa04c0044ac8c5e317d95f0895421..81c6703761d4484f4001d10a22123a9a5b859ce6 100644 (file)
--- a/src/time/clock_getres.c
+++ b/src/time/clock_getres.c
@@ -8,7 +8,7 @@ int clock_getres(clockid_t clk, struct timespec *ts)
        if (SYS_clock_getres != SYS_clock_getres_time64) {
                long ts32[2];
                int r = __syscall(SYS_clock_getres, clk, ts32);
-               if (!r) {
+               if (!r && ts) {
                        ts->tv_sec = ts32[0];
                        ts->tv_nsec = ts32[1];
                }