Solaris xf86OSRingBell() off-by-one error in filling iov[] array

When generating sound buffers for /dev/audio bells, insert waveform
for beep *or* silence, but not both, so we don't write one entry past
the end of the iov buffer when the final bit of soundwave ends up in
the final entry allocated in the iov array.

Fixes OpenSolaris bug 6894890:
 http://bugs.opensolaris.org/bugdatabase/view_bug.do?bug_id=6894890

Signed-off-by: Alan Coopersmith <alan.coopersmith@sun.com>
Reviewed-by: Peter Hutterer <peter.hutterer@who-t.net>
Acked-by: Adam Jackson <ajax@redhat.com>
Signed-off-by: Keith Packard <keithp@keithp.com>

1 files changed, 3 insertions, 2 deletions

diff --git a/hw/xfree86/os-support/solaris/sun_bell.c b/hw/xfree86/os-support/solaris/sun_bell.c
index 7f146eaaf..05d17492a 100644
--- a/hw/xfree86/os-support/solaris/sun_bell.c
+++ b/hw/xfree86/os-support/solaris/sun_bell.c
@@ -126,14 +126,15 @@ xf86OSRingBell(int loudness, int pitch, int duration)
     iovcnt = 0;
 
     for (cnt = 0; cnt <= repeats; cnt++) {
-        iov[iovcnt].iov_base = (char *) samples;
-        iov[iovcnt++].iov_len = sizeof(samples);
         if (cnt == repeats) {
             /* Insert a bit of silence so that multiple beeps are distinct and
              * not compressed into a single tone.
              */
             iov[iovcnt].iov_base = (char *) silence;
             iov[iovcnt++].iov_len = sizeof(silence);
+        } else {
+            iov[iovcnt].iov_base = (char *) samples;
+            iov[iovcnt++].iov_len = sizeof(samples);
         }
         if ((iovcnt >= IOV_MAX) || (cnt == repeats)) {
             written = writev(audioFD, iov, iovcnt);