linux-kernel - [PATCH 5.15 565/667] scsi: dc395x: Fix a missing check on list iterator

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20220607164951.640440564@linuxfoundation.org>
Date:   Tue,  7 Jun 2022 19:03:50 +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, Xiaomeng Tong <xiam0nd.tong@...il.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>
Subject: [PATCH 5.15 565/667] scsi: dc395x: Fix a missing check on list iterator

From: Xiaomeng Tong <xiam0nd.tong@...il.com>

commit 036a45aa587a10fa2abbd50fbd0f6c4cfc44f69f upstream.

The bug is here:

	p->target_id, p->target_lun);

The list iterator 'p' will point to a bogus position containing HEAD if the
list is empty or no element is found. This case must be checked before any
use of the iterator, otherwise it will lead to an invalid memory access.

To fix this bug, add a check. Use a new variable 'iter' as the list
iterator, and use the original variable 'p' as a dedicated pointer to point
to the found element.

Link: https://lore.kernel.org/r/20220414040231.2662-1-xiam0nd.tong@gmail.com
Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Cc: stable@...r.kernel.org
Signed-off-by: Xiaomeng Tong <xiam0nd.tong@...il.com>
Signed-off-by: Martin K. Petersen <martin.petersen@...cle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/scsi/dc395x.c |   15 ++++++++++++---
 1 file changed, 12 insertions(+), 3 deletions(-)

--- a/drivers/scsi/dc395x.c
+++ b/drivers/scsi/dc395x.c
@@ -3590,10 +3590,19 @@ static struct DeviceCtlBlk *device_alloc
 #endif
 	if (dcb->target_lun != 0) {
 		/* Copy settings */
-		struct DeviceCtlBlk *p;
-		list_for_each_entry(p, &acb->dcb_list, list)
-			if (p->target_id == dcb->target_id)
+		struct DeviceCtlBlk *p = NULL, *iter;
+
+		list_for_each_entry(iter, &acb->dcb_list, list)
+			if (iter->target_id == dcb->target_id) {
+				p = iter;
 				break;
+			}
+
+		if (!p) {
+			kfree(dcb);
+			return NULL;
+		}
+
 		dprintkdbg(DBG_1, 
 		       "device_alloc: <%02i-%i> copy from <%02i-%i>\n",
 		       dcb->target_id, dcb->target_lun,