linux-kernel - [PATCH 3.16 19/61] scsi: mptfusion: Add bounds check in mptctl_hp

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Message-ID: <lsq.1591725832.803339175@decadent.org.uk>
Date:   Tue, 09 Jun 2020 19:04:10 +0100
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, Denis Kirjanov <kda@...ux-powerpc.org>,
        "Dan Carpenter" <dan.carpenter@...cle.com>,
        "Johannes Thumshirn" <jthumshirn@...e.de>,
        "Martin K. Petersen" <martin.petersen@...cle.com>
Subject: [PATCH 3.16 19/61] scsi: mptfusion: Add bounds check in
 mptctl_hp_targetinfo()

3.16.85-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Dan Carpenter <dan.carpenter@...cle.com>

commit a7043e9529f3c367cc4d82997e00be034cbe57ca upstream.

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@...cle.com>
Reviewed-by: Johannes Thumshirn <jthumshirn@...e.de>
Signed-off-by: Martin K. Petersen <martin.petersen@...cle.com>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/message/fusion/mptctl.c | 2 ++
 1 file changed, 2 insertions(+)

--- 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));