linux-kernel - [34-longterm 197/209] av7110: check for negative array offset

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Date:	Thu, 14 Apr 2011 13:55:55 -0400
From:	Paul Gortmaker <paul.gortmaker@...driver.com>
To:	stable@...nel.org, linux-kernel@...r.kernel.org
Cc:	stable-review@...nel.org, Dan Carpenter <error27@...il.com>,
	Mauro Carvalho Chehab <mchehab@...hat.com>,
	Paul Gortmaker <paul.gortmaker@...driver.com>
Subject: [34-longterm 197/209] av7110: check for negative array offset

From: Dan Carpenter <error27@...il.com>

  =====================================================================
  | This is a commit scheduled for the next v2.6.34 longterm release. |
  | If you see a problem with using this for longterm, please comment.|
  =====================================================================

commit cb26a24ee9706473f31d34cc259f4dcf45cd0644 upstream

info->num comes from the user.  It's type int.  If the user passes
in a negative value that would cause memory corruption.

Signed-off-by: Dan Carpenter <error27@...il.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@...hat.com>
Signed-off-by: Paul Gortmaker <paul.gortmaker@...driver.com>
---
 drivers/media/dvb/ttpci/av7110_ca.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/drivers/media/dvb/ttpci/av7110_ca.c b/drivers/media/dvb/ttpci/av7110_ca.c
index ac7779c..d884aac 100644
--- a/drivers/media/dvb/ttpci/av7110_ca.c
+++ b/drivers/media/dvb/ttpci/av7110_ca.c
@@ -278,7 +278,7 @@ static int dvb_ca_ioctl(struct inode *inode, struct file *file,
 	{
 		ca_slot_info_t *info=(ca_slot_info_t *)parg;
 
-		if (info->num > 1)
+		if (info->num < 0 || info->num > 1)
 			return -EINVAL;
 		av7110->ci_slot[info->num].num = info->num;
 		av7110->ci_slot[info->num].type = FW_CI_LL_SUPPORT(av7110->arm_app) ?
-- 
1.7.4.4

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