From 95bcf5b14e31a232bdeb606219c5eaa5b96e285c Mon Sep 17 00:00:00 2001
From: Dan Carpenter <dan.carpenter@oracle.com>
Date: Thu, 25 Jan 2018 17:27:27 +0300
Subject: [PATCH] scsi: mptfusion: Add bounds check in mptctl_hp_targetinfo()

[ Upstream commit a7043e9529f3c367cc4d82997e00be034cbe57ca ]

My static checker complains about an out of bounds read:

    drivers/message/fusion/mptctl.c:2786 mptctl_hp_targetinfo()
    error: buffer overflow 'hd->sel_timeout' 255 <= u32max.

It's true that we probably should have a bounds check here.

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/message/fusion/mptctl.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/message/fusion/mptctl.c b/drivers/message/fusion/mptctl.c
index 02b5f69e1a42..14cf6dfc3b14 100644
--- a/drivers/message/fusion/mptctl.c
+++ b/drivers/message/fusion/mptctl.c
@@ -2698,6 +2698,8 @@ mptctl_hp_targetinfo(unsigned long arg)
 				__FILE__, __LINE__, iocnum);
 		return -ENODEV;
 	}
+	if (karg.hdr.id >= MPT_MAX_FC_DEVICES)
+		return -EINVAL;
 	dctlprintk(ioc, printk(MYIOC_s_DEBUG_FMT "mptctl_hp_targetinfo called.\n",
 	    ioc->name));
 
-- 
2.20.1