linux-kernel - [Linux-kernel-mentees] [PATCH] scsi/megaraid: Prevent kernel-infoleak in kioc_to

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Date:   Mon, 27 Jul 2020 17:02:35 -0400
From:   Peilin Ye <yepeilin.cs@...il.com>
To:     Kashyap Desai <kashyap.desai@...adcom.com>,
        Sumit Saxena <sumit.saxena@...adcom.com>
Cc:     Peilin Ye <yepeilin.cs@...il.com>,
        Dan Carpenter <dan.carpenter@...cle.com>,
        Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Shivasharan S <shivasharan.srikanteshwara@...adcom.com>,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        linux-kernel-mentees@...ts.linuxfoundation.org,
        megaraidlinux.pdl@...adcom.com, linux-scsi@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [Linux-kernel-mentees] [PATCH] scsi/megaraid: Prevent kernel-infoleak in kioc_to_mimd()

hinfo_to_cinfo() does no operation on `cinfo` when `hinfo` is NULL,
causing kioc_to_mimd() to copy uninitialized stack memory to userspace.
Fix it by initializing `cinfo` with memset().

Cc: stable@...r.kernel.org
Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Suggested-by: Dan Carpenter <dan.carpenter@...cle.com>
Suggested-by: Arnd Bergmann <arnd@...db.de>
Signed-off-by: Peilin Ye <yepeilin.cs@...il.com>
---
 drivers/scsi/megaraid/megaraid_mm.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/scsi/megaraid/megaraid_mm.c b/drivers/scsi/megaraid/megaraid_mm.c
index 8df53446641a..9df0e6b253a8 100644
--- a/drivers/scsi/megaraid/megaraid_mm.c
+++ b/drivers/scsi/megaraid/megaraid_mm.c
@@ -816,6 +816,8 @@ kioc_to_mimd(uioc_t *kioc, mimd_t __user *mimd)
 
 		case MEGAIOC_QADAPINFO:
 
+			memset(&cinfo, 0, sizeof(cinfo));
+
 			hinfo = (mraid_hba_info_t *)(unsigned long)
 					kioc->buf_vaddr;
 
-- 
2.25.1