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authorTejun Heo <htejun@gmail.com>2006-12-17 10:46:33 +0900
committerJeff Garzik <jeff@garzik.org>2006-12-20 14:26:26 -0500
commit2e5704f63ed56b040a3189f6b7eb17f6f849ea22 (patch)
tree4b3df2d375da3fefa5a8d22f6f41a9e5f7ce5798
parentad706991f4f0d1476aecbdae2df5e36552b340b2 (diff)
[PATCH] libata: take scmd->cmd_len into account when translating SCSI commands
libata depended on SCSI command to have the correct length when tranlating it into an ATA command. This generally worked for commands issued by SCSI HLD but user could issue arbitrary broken command using sg interface. Also, when building ATAPI command, full command size was always copied. Because some ATAPI devices needs bytes after CDB cleared, if upper layer doesn't clear bytes after CDB, such devices will malfunction. This necessiated recent clear-garbage-after-CDB fix in sg interfaces. However, scsi_execute() isn't fixed yet and HL-DT-ST DVD-RAM GSA-H30N malfunctions on initialization commands issued from SCSI. This patch makes xlat functions always consider SCSI cmd_len. Each translation function checks for proper cmd_len and ATAPI translaation clears bytes after CDB. Signed-off-by: Tejun Heo <htejun@gmail.com> Cc: Jens Axboe <jens.axboe@oracle.com> Cc: Douglas Gilbert <dougg@torque.net> Signed-off-by: Jeff Garzik <jeff@garzik.org>
-rw-r--r--drivers/ata/libata-scsi.c29
1 files changed, 25 insertions, 4 deletions
diff --git a/drivers/ata/libata-scsi.c b/drivers/ata/libata-scsi.c
index 307910bd62c..836947da5b1 100644
--- a/drivers/ata/libata-scsi.c
+++ b/drivers/ata/libata-scsi.c
@@ -953,6 +953,9 @@ static unsigned int ata_scsi_start_stop_xlat(struct ata_queued_cmd *qc)
struct ata_taskfile *tf = &qc->tf;
const u8 *cdb = scmd->cmnd;
+ if (scmd->cmd_len < 5)
+ goto invalid_fld;
+
tf->flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_ISADDR;
tf->protocol = ATA_PROT_NODATA;
if (cdb[1] & 0x1) {
@@ -1144,11 +1147,15 @@ static unsigned int ata_scsi_verify_xlat(struct ata_queued_cmd *qc)
tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
tf->protocol = ATA_PROT_NODATA;
- if (cdb[0] == VERIFY)
+ if (cdb[0] == VERIFY) {
+ if (scmd->cmd_len < 10)
+ goto invalid_fld;
scsi_10_lba_len(cdb, &block, &n_block);
- else if (cdb[0] == VERIFY_16)
+ } else if (cdb[0] == VERIFY_16) {
+ if (scmd->cmd_len < 16)
+ goto invalid_fld;
scsi_16_lba_len(cdb, &block, &n_block);
- else
+ } else
goto invalid_fld;
if (!n_block)
@@ -1271,12 +1278,16 @@ static unsigned int ata_scsi_rw_xlat(struct ata_queued_cmd *qc)
switch (cdb[0]) {
case READ_10:
case WRITE_10:
+ if (unlikely(scmd->cmd_len < 10))
+ goto invalid_fld;
scsi_10_lba_len(cdb, &block, &n_block);
if (unlikely(cdb[1] & (1 << 3)))
tf_flags |= ATA_TFLAG_FUA;
break;
case READ_6:
case WRITE_6:
+ if (unlikely(scmd->cmd_len < 6))
+ goto invalid_fld;
scsi_6_lba_len(cdb, &block, &n_block);
/* for 6-byte r/w commands, transfer length 0
@@ -1287,6 +1298,8 @@ static unsigned int ata_scsi_rw_xlat(struct ata_queued_cmd *qc)
break;
case READ_16:
case WRITE_16:
+ if (unlikely(scmd->cmd_len < 16))
+ goto invalid_fld;
scsi_16_lba_len(cdb, &block, &n_block);
if (unlikely(cdb[1] & (1 << 3)))
tf_flags |= ATA_TFLAG_FUA;
@@ -2355,7 +2368,8 @@ static unsigned int atapi_xlat(struct ata_queued_cmd *qc)
if (ata_check_atapi_dma(qc))
using_pio = 1;
- memcpy(&qc->cdb, scmd->cmnd, dev->cdb_len);
+ memset(qc->cdb, 0, dev->cdb_len);
+ memcpy(qc->cdb, scmd->cmnd, scmd->cmd_len);
qc->complete_fn = atapi_qc_complete;
@@ -2696,6 +2710,13 @@ static inline int __ata_scsi_queuecmd(struct scsi_cmnd *scmd,
{
int rc = 0;
+ if (unlikely(!scmd->cmd_len)) {
+ ata_dev_printk(dev, KERN_WARNING, "WARNING: zero len CDB\n");
+ scmd->result = DID_ERROR << 16;
+ done(scmd);
+ return 0;
+ }
+
if (dev->class == ATA_DEV_ATA) {
ata_xlat_func_t xlat_func = ata_get_xlat_func(dev,
scmd->cmnd[0]);