54 lines
1.8 KiB
Diff
54 lines
1.8 KiB
Diff
|
From: Dan Carpenter <dan.carpenter@oracle.com>
|
||
|
|
Date: Thu, 5 Feb 2015 10:37:33 +0300
|
||
|
|
Subject: [PATCH] vhost/scsi: potential memory corruption
|
||
|
|
|
||
|
|
This code in vhost_scsi_make_tpg() is confusing because we limit "tpgt"
|
||
|
|
to UINT_MAX but the data type of "tpg->tport_tpgt" and that is a u16.
|
||
|
|
|
||
|
|
I looked at the context and it turns out that in
|
||
|
|
vhost_scsi_set_endpoint(), "tpg->tport_tpgt" is used as an offset into
|
||
|
|
the vs_tpg[] array which has VHOST_SCSI_MAX_TARGET (256) elements so
|
||
|
|
anything higher than 255 then it is invalid. I have made that the limit
|
||
|
|
now.
|
||
|
|
|
||
|
|
In vhost_scsi_send_evt() we mask away values higher than 255, but now
|
||
|
|
that the limit has changed, we don't need the mask.
|
||
|
|
|
||
|
|
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
|
||
|
|
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
|
||
|
|
---
|
||
|
|
drivers/vhost/scsi.c | 6 +++---
|
||
|
|
1 file changed, 3 insertions(+), 3 deletions(-)
|
||
|
|
|
||
|
|
diff --git a/drivers/vhost/scsi.c b/drivers/vhost/scsi.c
|
||
|
|
index dc78d87e0fc2..d27cfb20776f 100644
|
||
|
|
--- a/drivers/vhost/scsi.c
|
||
|
|
+++ b/drivers/vhost/scsi.c
|
||
|
|
@@ -1253,7 +1253,7 @@ tcm_vhost_send_evt(struct vhost_scsi *vs,
|
||
|
|
* lun[4-7] need to be zero according to virtio-scsi spec.
|
||
|
|
*/
|
||
|
|
evt->event.lun[0] = 0x01;
|
||
|
|
- evt->event.lun[1] = tpg->tport_tpgt & 0xFF;
|
||
|
|
+ evt->event.lun[1] = tpg->tport_tpgt;
|
||
|
|
if (lun->unpacked_lun >= 256)
|
||
|
|
evt->event.lun[2] = lun->unpacked_lun >> 8 | 0x40 ;
|
||
|
|
evt->event.lun[3] = lun->unpacked_lun & 0xFF;
|
||
|
|
@@ -2124,12 +2124,12 @@ tcm_vhost_make_tpg(struct se_wwn *wwn,
|
||
|
|
struct tcm_vhost_tport, tport_wwn);
|
||
|
|
|
||
|
|
struct tcm_vhost_tpg *tpg;
|
||
|
|
- unsigned long tpgt;
|
||
|
|
+ u16 tpgt;
|
||
|
|
int ret;
|
||
|
|
|
||
|
|
if (strstr(name, "tpgt_") != name)
|
||
|
|
return ERR_PTR(-EINVAL);
|
||
|
|
- if (kstrtoul(name + 5, 10, &tpgt) || tpgt > UINT_MAX)
|
||
|
|
+ if (kstrtou16(name + 5, 10, &tpgt) || tpgt >= VHOST_SCSI_MAX_TARGET)
|
||
|
|
return ERR_PTR(-EINVAL);
|
||
|
|
|
||
|
|
tpg = kzalloc(sizeof(struct tcm_vhost_tpg), GFP_KERNEL);
|
||
|
|
--
|
||
|
|
2.1.0
|
||
|
|
|