| From | Sasha Levin <> | Subject | [PATCH AUTOSEL 4.19 172/191] scsi: NCR5380: Check for invalid reselection target | Date | Sat, 9 Nov 2019 21:39:54 -0500 |
| |
From: Finn Thain <fthain@telegraphics.com.au>
[ Upstream commit 7ef55f6744c45e3d7c85a3f74ada39b67ac741dd ]
The X3T9.2 specification (draft) says, under "6.1.4.1 RESELECTION", that "the initiator shall not respond to a RESELECTION phase if other than two SCSI ID bits are on the DATA BUS." This issue (too many bits set) has been observed in the wild, so add a check.
Tested-by: Michael Schmitz <schmitzmic@gmail.com> Signed-off-by: Finn Thain <fthain@telegraphics.com.au> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com> Signed-off-by: Sasha Levin <sashal@kernel.org> --- drivers/scsi/NCR5380.c | 5 +++++ 1 file changed, 5 insertions(+)
diff --git a/drivers/scsi/NCR5380.c b/drivers/scsi/NCR5380.c index 90136942f4882..c67f476447372 100644 --- a/drivers/scsi/NCR5380.c +++ b/drivers/scsi/NCR5380.c @@ -2008,6 +2008,11 @@ static void NCR5380_reselect(struct Scsi_Host *instance) NCR5380_write(MODE_REG, MR_BASE); target_mask = NCR5380_read(CURRENT_SCSI_DATA_REG) & ~(hostdata->id_mask); + if (!target_mask || target_mask & (target_mask - 1)) { + shost_printk(KERN_WARNING, instance, + "reselect: bad target_mask 0x%02x\n", target_mask); + return; + } dsprintk(NDEBUG_RESELECTION, instance, "reselect\n"); -- 2.20.1
|