linux-kernel - Re: [PATCH] staging: speakup: ensure we do not overrun synths array

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Message-ID: <20160509224402.GV3473@var.home>
Date:	Tue, 10 May 2016 00:44:02 +0200
From:	Samuel Thibault <samuel.thibault@...-lyon.org>
To:	Colin King <colin.king@...onical.com>
Cc:	William Hubbs <w.d.hubbs@...il.com>,
	Chris Brannon <chris@...-brannons.com>,
	Kirk Reiser <kirk@...sers.ca>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Amitoj Kaur Chawla <amitoj1606@...il.com>,
	speakup@...ux-speakup.org, devel@...verdev.osuosl.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] staging: speakup: ensure we do not overrun synths array

Colin King, on Mon 09 May 2016 23:22:14 +0100, wrote:
> From: Colin Ian King <colin.king@...onical.com>
> 
> synth_add allows one to add MAXSYNTHS synths to the synths array;
> however it always NULLifies the next synth in the array which
> means that on the MAXSYNTHS synth we get an out-of-bounds write of
> the NULL to the synths array.  Make the synths array MAXSYNTHS + 1
> elements in size to allow for the final NULL sentinal to avoid the
> out-of-bounds write.
> 
> Issue found wit CoverityScan, CID#744671
> 
> Signed-off-by: Colin Ian King <colin.king@...onical.com>

Reviewed-by: Samuel Thibault <samuel.thibault@...-lyon.org>

> ---
>  drivers/staging/speakup/synth.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/staging/speakup/synth.c b/drivers/staging/speakup/synth.c
> index 4f462c3..810a214 100644
> --- a/drivers/staging/speakup/synth.c
> +++ b/drivers/staging/speakup/synth.c
> @@ -18,7 +18,7 @@
>  #include "serialio.h"
>  
>  #define MAXSYNTHS       16      /* Max number of synths in array. */
> -static struct spk_synth *synths[MAXSYNTHS];
> +static struct spk_synth *synths[MAXSYNTHS + 1];
>  struct spk_synth *synth;
>  char spk_pitch_buff[32] = "";
>  static int module_status;
> -- 
> 2.8.1
> 

-- 
Samuel
Actually, typing random strings in the Finder does the equivalent of
filename completion.
(Discussion in comp.os.linux.misc on the intuitiveness of commands: file
completion vs. the Mac Finder.)