linux-kernel - [PATCH] scsi: aic79xx: add scb NULL check in ahd_handle_msg

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Message-ID: <20240401061010.589751-1-aaprelkov@usergate.com>
Date: Mon, 1 Apr 2024 13:10:09 +0700
From: Aleksandr Aprelkov <aaprelkov@...rgate.com>
To: Hannes Reinecke <hare@...e.com>
CC: Aleksandr Aprelkov <aaprelkov@...rgate.com>,"James E.J. Bottomley" <jejb@...ux.ibm.com>,"Martin K. Petersen" <martin.petersen@...cle.com>,<linux-scsi@...r.kernel.org>,<linux-kernel@...r.kernel.org>,<lvc-project@...uxtesting.org>
Subject: [PATCH] scsi: aic79xx: add scb NULL check in ahd_handle_msg_reject()

If ahd_lookup_scb() returns NULL and ahd_sent_msg() checks are false,
then NULL pointer dereference happens

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

Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Signed-off-by: Aleksandr Aprelkov <aaprelkov@...rgate.com>
---
 drivers/scsi/aic7xxx/aic79xx_core.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/scsi/aic7xxx/aic79xx_core.c b/drivers/scsi/aic7xxx/aic79xx_core.c
index 3e3100dbfda3..9e0fafa12e87 100644
--- a/drivers/scsi/aic7xxx/aic79xx_core.c
+++ b/drivers/scsi/aic7xxx/aic79xx_core.c
@@ -5577,7 +5577,7 @@ ahd_handle_msg_reject(struct ahd_softc *ahd, struct ahd_devinfo *devinfo)
 		       "Using asynchronous transfers\n",
 		       ahd_name(ahd), devinfo->channel,
 		       devinfo->target, devinfo->lun);
-	} else if ((scb->hscb->control & SIMPLE_QUEUE_TAG) != 0) {
+	} else if (scb && (scb->hscb->control & SIMPLE_QUEUE_TAG) != 0) {
 		int tag_type;
 		int mask;

-- 
2.34.1