Staging: speakup: don't die if accessing sysfs without synth

Setting a 'silent' parameter without a synth would crash the kernel.

Signed-off-by: Sasha Levin <sasha.levin@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/staging/speakup/synth.c b/drivers/staging/speakup/synth.c
index 0b3549bd909d0619a594155f91a3f18372eeb7be..172cf62b1aaffaf8faebe84df119b8b1e0ebd249 100644 (file)
--- a/drivers/staging/speakup/synth.c
+++ b/drivers/staging/speakup/synth.c
@@ -212,6 +212,9 @@ void synth_start(void)
 
 void spk_do_flush(void)
 {
+       if (!synth)
+               return;
+
        speakup_info.flushing = 1;
        synth_buffer_clear();
        if (synth->alive) {