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| author | Finn Thain <fthain@telegraphics.com.au> | 2018-09-27 04:17:11 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-11-25 11:53:03 +0300 |
| commit | f876c37ef29630f24481488c6648e7b96077bb12 (patch) | |
| tree | f5a11166bd9b55c0d953bca527598db7c794b8f0 /drivers | |
| parent | acef2f05863c5678618ec9fd061adca6d5f67b08 (diff) | |
| download | linux-f876c37ef29630f24481488c6648e7b96077bb12.tar.xz | |
scsi: NCR5380: Check for invalid reselection target
[ 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>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/scsi/NCR5380.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/scsi/NCR5380.c b/drivers/scsi/NCR5380.c index 35419ba32c46..15c0fff7519b 100644 --- a/drivers/scsi/NCR5380.c +++ b/drivers/scsi/NCR5380.c @@ -2102,6 +2102,11 @@ 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"); |