diff options
| author | Bart Van Assche <bvanassche@acm.org> | 2019-01-23 11:12:37 -0800 |
|---|---|---|
| committer | Martin K. Petersen <martin.petersen@oracle.com> | 2019-01-29 00:49:23 -0500 |
| commit | db5db4b91cabcf57f3efd98d92d24ab875cde8ae (patch) | |
| tree | e9f7a50d213e0ff5022aa8080fea26c144290341 /drivers/scsi/sd.c | |
| parent | 59abc8cc05856cb31d6e07a8e25f0d749d559233 (diff) | |
scsi: sd: Protect against READ(6) or WRITE(6) with zero block transfer length
Since the READ(6) and WRITE(6) commands interpret a zero in the transfer
length field in the CDB as 256 logical blocks, avoid submitting such
commands.
Cc: Douglas Gilbert <dgilbert@interlog.com>
Cc: Hannes Reinecke <hare@suse.com>
Cc: Christoph Hellwig <hch@lst.de>
Reported-by: Douglas Gilbert <dgilbert@interlog.com>
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Reviewed-by: Douglas Gilbert <dgilbert@interlog.com>
Reviewed-by: Hannes Reinecke <hare@suse.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Diffstat (limited to 'drivers/scsi/sd.c')
| -rw-r--r-- | drivers/scsi/sd.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c index 7a1cf6c80f6a..4fbb8310e268 100644 --- a/drivers/scsi/sd.c +++ b/drivers/scsi/sd.c @@ -1128,6 +1128,10 @@ static blk_status_t sd_setup_rw6_cmnd(struct scsi_cmnd *cmd, bool write, sector_t lba, unsigned int nr_blocks, unsigned char flags) { + /* Avoid that 0 blocks gets translated into 256 blocks. */ + if (WARN_ON_ONCE(nr_blocks == 0)) + return BLK_STS_IOERR; + if (unlikely(flags & 0x8)) { /* * This happens only if this drive failed 10byte rw |