linux-kernel - [PATCH AUTOSEL 6.6 120/139] scsi: NCR5380: Initialize buffer for MSG IN and STATUS transfers

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Message-ID: <20240925121137.1307574-120-sashal@kernel.org>
Date: Wed, 25 Sep 2024 08:09:00 -0400
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Finn Thain <fthain@...ux-m68k.org>,
	Stan Johnson <userm57@...oo.com>,
	"Martin K . Petersen" <martin.petersen@...cle.com>,
	Sasha Levin <sashal@...nel.org>,
	schmitzmic@...il.com,
	James.Bottomley@...senPartnership.com,
	linux-scsi@...r.kernel.org
Subject: [PATCH AUTOSEL 6.6 120/139] scsi: NCR5380: Initialize buffer for MSG IN and STATUS transfers

From: Finn Thain <fthain@...ux-m68k.org>

[ Upstream commit 1c71065df2df693d208dd32758171c1dece66341 ]

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>
Link: https://lore.kernel.org/r/52e02a8812ae1a2d810d7f9f7fd800c3ccc320c4.1723001788.git.fthain@linux-m68k.org
Signed-off-by: Martin K. Petersen <martin.petersen@...cle.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/scsi/NCR5380.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/scsi/NCR5380.c b/drivers/scsi/NCR5380.c
index cea3a79d538e4..a99221ead3e00 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;
-- 
2.43.0