linux-kernel - [PATCH 06/11] scsi: NCR5380: Initialize buffer for MSG IN and STATUS transfers

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Message-Id: <52e02a8812ae1a2d810d7f9f7fd800c3ccc320c4.1723001788.git.fthain@linux-m68k.org>
Date: Wed, 07 Aug 2024 13:36:28 +1000
From: Finn Thain <fthain@...ux-m68k.org>
To: "James E.J. Bottomley" <James.Bottomley@...senPartnership.com>,
    "Martin K. Petersen" <martin.petersen@...cle.com>
Cc: Hannes Reinecke <hare@...e.com>,
    Michael Schmitz <schmitzmic@...il.com>,
    Ondrej Zary <linux@...y.sk>,
    Stan Johnson <userm57@...oo.com>,
    linux-scsi@...r.kernel.org,
    linux-kernel@...r.kernel.org
Subject: [PATCH 06/11] scsi: NCR5380: Initialize buffer for MSG IN and STATUS
 transfers

Following an incomplete transfer in MSG IN phase, the driver would not
notice the problem and would make use of invalid data. Initialize 'tmp'
appropriately and bail out if no message was received. For STATUS phase,
preserve the existing status code unless a new value was transferred.

Tested-by: Stan Johnson <userm57@...oo.com>
Signed-off-by: Finn Thain <fthain@...ux-m68k.org>
---
 drivers/scsi/NCR5380.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/scsi/NCR5380.c b/drivers/scsi/NCR5380.c
index 00e245173320..4fcb73b727aa 100644
--- a/drivers/scsi/NCR5380.c
+++ b/drivers/scsi/NCR5380.c
@@ -1807,8 +1807,11 @@ static void NCR5380_information_transfer(struct Scsi_Host *instance)
 				return;
 			case PHASE_MSGIN:
 				len = 1;
+				tmp = 0xff;
 				data = &tmp;
 				NCR5380_transfer_pio(instance, &phase, &len, &data, 0);
+				if (tmp == 0xff)
+					break;
 				ncmd->message = tmp;
 
 				switch (tmp) {
@@ -1996,6 +1999,7 @@ static void NCR5380_information_transfer(struct Scsi_Host *instance)
 				break;
 			case PHASE_STATIN:
 				len = 1;
+				tmp = ncmd->status;
 				data = &tmp;
 				NCR5380_transfer_pio(instance, &phase, &len, &data, 0);
 				ncmd->status = tmp;
-- 
2.39.5