linux-kernel - Re: [PATCH] drivers/staging/speakup: avoid out-of-range access

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Date:	Sat, 5 Jan 2013 20:29:44 +0100
From:	Samuel Thibault <samuel.thibault@...-lyon.org>
To:	Nickolai Zeldovich <nickolai@...il.mit.edu>,
	gregkh@...uxfoundation.org
Cc:	William Hubbs <w.d.hubbs@...il.com>,
	Chris Brannon <chris@...-brannons.com>,
	Kirk Reiser <kirk@...ille.uwo.ca>,
	linux-kernel@...r.kernel.org, speakup@...ille.uwo.ca
Subject: Re: [PATCH] drivers/staging/speakup: avoid out-of-range access

Indeed. The same happens in synth_add, so Greg please use this instead:


Check that array index is in-bounds before accessing the synths[] array.

Signed-off-by: Nickolai Zeldovich <nickolai@...il.mit.edu>
Signed-off-by: Samuel Thibault <samuel.thibault@...-lyon.org>

---
 drivers/staging/speakup/synth.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/staging/speakup/synth.c b/drivers/staging/speakup/synth.c
index df95337..b91d22b 100644
--- a/drivers/staging/speakup/synth.c
+++ b/drivers/staging/speakup/synth.c
@@ -342,7 +342,7 @@ int synth_init(char *synth_name)
 
 	mutex_lock(&spk_mutex);
 	/* First, check if we already have it loaded. */
-	for (i = 0; synths[i] != NULL && i < MAXSYNTHS; i++)
+	for (i = 0; i < MAXSYNTHS && synths[i] != NULL; i++)
 		if (strcmp(synths[i]->name, synth_name) == 0)
 			synth = synths[i];
 
@@ -423,7 +423,7 @@ int synth_add(struct spk_synth *in_synth
 	int i;
 	int status = 0;
 	mutex_lock(&spk_mutex);
-	for (i = 0; synths[i] != NULL && i < MAXSYNTHS; i++)
+	for (i = 0; i < MAXSYNTHS && synths[i] != NULL; i++)
 		/* synth_remove() is responsible for rotating the array down */
 		if (in_synth == synths[i]) {
 			mutex_unlock(&spk_mutex);
--
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