linux-kernel - [PATCH 4.9 23/28] scsi: qla2xxx: Fix incorrect region-size setting in optrom SYSFS routines

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Date:   Thu,  9 May 2019 20:42:15 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Andrew Vasquez <andrewv@...vell.com>,
        Himanshu Madhani <hmadhani@...vell.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>
Subject: [PATCH 4.9 23/28] scsi: qla2xxx: Fix incorrect region-size setting in optrom SYSFS routines

From: Andrew Vasquez <andrewv@...vell.com>

commit 5cbdae10bf11f96e30b4d14de7b08c8b490e903c upstream.

Commit e6f77540c067 ("scsi: qla2xxx: Fix an integer overflow in sysfs
code") incorrectly set 'optrom_region_size' to 'start+size', which can
overflow option-rom boundaries when 'start' is non-zero.  Continue setting
optrom_region_size to the proper adjusted value of 'size'.

Fixes: e6f77540c067 ("scsi: qla2xxx: Fix an integer overflow in sysfs code")
Cc: stable@...r.kernel.org
Signed-off-by: Andrew Vasquez <andrewv@...vell.com>
Signed-off-by: Himanshu Madhani <hmadhani@...vell.com>
Signed-off-by: Martin K. Petersen <martin.petersen@...cle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/scsi/qla2xxx/qla_attr.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/drivers/scsi/qla2xxx/qla_attr.c
+++ b/drivers/scsi/qla2xxx/qla_attr.c
@@ -345,7 +345,7 @@ qla2x00_sysfs_write_optrom_ctl(struct fi
 		}

 		ha->optrom_region_start = start;
-		ha->optrom_region_size = start + size;
+		ha->optrom_region_size = size;

 		ha->optrom_state = QLA_SREADING;
 		ha->optrom_buffer = vmalloc(ha->optrom_region_size);
@@ -418,7 +418,7 @@ qla2x00_sysfs_write_optrom_ctl(struct fi
 		}

 		ha->optrom_region_start = start;
-		ha->optrom_region_size = start + size;
+		ha->optrom_region_size = size;

 		ha->optrom_state = QLA_SWRITING;
 		ha->optrom_buffer = vmalloc(ha->optrom_region_size);