linux-kernel - [PATCH] scsi: megaraid: Fix null dereference

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Message-Id: <20230403143440.1923323-1-Igor.A.Artemiev@mcst.ru>
Date:   Mon,  3 Apr 2023 17:34:40 +0300
From:   Igor Artemiev <Igor.A.Artemiev@...t.ru>
To:     Kashyap Desai <kashyap.desai@...adcom.com>
Cc:     Igor Artemiev <Igor.A.Artemiev@...t.ru>,
        Sumit Saxena <sumit.saxena@...adcom.com>,
        Shivasharan S <shivasharan.srikanteshwara@...adcom.com>,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        megaraidlinux.pdl@...adcom.com, linux-scsi@...r.kernel.org,
        linux-kernel@...r.kernel.org, lvc-project@...uxtesting.org
Subject: [PATCH] scsi: megaraid: Fix null dereference

When cmdid == CMDID_INT_CMDS, the 'mbox' pointer is NULL but is
dereferenced below.

Found by Linux Verification Center (linuxtesting.org) with SVACE.

Fixes: 0f2bb84d2a68 ("[SCSI] megaraid: simplify internal command handling")
Signed-off-by: Igor Artemiev <Igor.A.Artemiev@...t.ru>
---
 drivers/scsi/megaraid.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/scsi/megaraid.c b/drivers/scsi/megaraid.c
index bf491af9f0d6..4fbf92dc717e 100644
--- a/drivers/scsi/megaraid.c
+++ b/drivers/scsi/megaraid.c
@@ -1441,6 +1441,7 @@ mega_cmd_done(adapter_t *adapter, u8 completed[], int nstatus, int status)
 		 */
 		if (cmdid == CMDID_INT_CMDS) {
 			scb = &adapter->int_scb;
+			mbox = (mbox_t *)scb->raw_mbox;
 
 			list_del_init(&scb->list);
 			scb->state = SCB_FREE;
-- 
2.30.2