linux-kernel - Re: [PATCH] snic: correctly check for array overrun on overly long version number

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Date:	Wed, 2 Mar 2016 08:54:10 +0000
From:	"Narsimhulu Musini (nmusini)" <nmusini@...co.com>
To:	Colin King <colin.king@...onical.com>,
	"Sesidhar Baddela (sebaddel)" <sebaddel@...co.com>,
	"James E . J . Bottomley" <JBottomley@...n.com>,
	"Martin K . Petersen" <martin.petersen@...cle.com>,
	"linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] snic: correctly check for array overrun on overly long
 version number

On 26/02/16 4:28 am, "Colin King" <colin.king@...onical.com> wrote:

>From: Colin Ian King <colin.king@...onical.com>
>
>The snic version number is expected to be 4 decimals in the form like
>a netmask string with each number stored in an element in array v.
>However, there is an off-by-one check on the number of elements in v
>allowing one to pass a 5 decimal version number causing v[4] to be
>referenced, causing a buffer overrun.  Fix the off-by-one error by
>comparing to i > 3 rather than 4.
Acked-by: Narsimhulu Musini <nmusini@...co.com>

>
>Signed-off-by: Colin Ian King <colin.king@...onical.com>
>---
> drivers/scsi/snic/snic_ctl.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
>diff --git a/drivers/scsi/snic/snic_ctl.c b/drivers/scsi/snic/snic_ctl.c
>index aebe753..ab0e06b 100644
>--- a/drivers/scsi/snic/snic_ctl.c
>+++ b/drivers/scsi/snic/snic_ctl.c
>@@ -75,7 +75,7 @@ snic_ver_enc(const char *s)
> 			continue;
> 		}
> 
>-		if (i > 4 || !isdigit(c))
>+		if (i > 3 || !isdigit(c))
> 			goto end;
> 
> 		v[i] = v[i] * 10 + (c - '0');
>-- 
>2.7.0
>