linux-kernel - [PATCH] Staging: speakup: don't die if accessing sysfs without synth

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Date:	Tue, 27 May 2014 19:08:36 -0400
From:	Sasha Levin <sasha.levin@...cle.com>
To:	w.d.hubbs@...il.com, chris@...-brannons.com, kirk@...sers.ca,
	samuel.thibault@...-lyon.org, gregkh@...uxfoundation.org
Cc:	speakup@...ille.uwo.ca, devel@...verdev.osuosl.org,
	linux-kernel@...r.kernel.org, Sasha Levin <sasha.levin@...cle.com>
Subject: [PATCH] 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@...cle.com>
---
 drivers/staging/speakup/synth.c |    3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/staging/speakup/synth.c b/drivers/staging/speakup/synth.c
index 0b3549b..172cf62 100644
--- 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) {
-- 
1.7.10.4

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