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scsi: NCR5380: Initialize buffer for MSG IN and STATUS transfers

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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@yahoo.com>
Signed-off-by: Finn Thain <fthain@linux-m68k.org>
Link: https://lore.kernel.org/r/52e02a8812ae1a2d810d7f9f7fd800c3ccc320c4.1723001788.git.fthain@linux-m68k.org
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Finn Thain 2024-08-07 13:36:28 +10:00 committed by Martin K. Petersen
parent 2ac6d29716
commit 1c71065df2
1 changed files with 4 additions and 0 deletions
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4
drivers/scsi/NCR5380.c
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@ -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;