On Tue, Dec 14, 2021 at 09:16:51AM -0500, George Kennedy wrote:
Avoid data corruption by rejecting pass-through commands where T_LENGTH is zero (No data is transferred) and the dma direction is not DMA_NONE.
Cc: stable@vger.kernel.org Reported-by: syzkallersyzkaller@googlegroups.com Signed-off-by: George Kennedygeorge.kennedy@oracle.com
drivers/ata/libata-scsi.c | 15 +++++++++++++-- 1 file changed, 13 insertions(+), 2 deletions(-)
diff --git a/drivers/ata/libata-scsi.c b/drivers/ata/libata-scsi.c index 1b84d55..313e947 100644 --- a/drivers/ata/libata-scsi.c +++ b/drivers/ata/libata-scsi.c @@ -2859,8 +2859,19 @@ static unsigned int ata_scsi_pass_thru(struct ata_queued_cmd *qc) goto invalid_fld; }
- if (ata_is_ncq(tf->protocol) && (cdb[2 + cdb_offset] & 0x3) == 0)
tf->protocol = ATA_PROT_NCQ_NODATA;
- if ((cdb[2 + cdb_offset] & 0x3) == 0) {
/** When T_LENGTH is zero (No data is transferred), dir should* be DMA_NONE.*/if (scmd->sc_data_direction != DMA_NONE) {fp = 2 + cdb_offset;goto invalid_fld;}if (ata_is_ncq(tf->protocol))tf->protocol = ATA_PROT_NCQ_NODATA;- }
/* enable LBA */ tf->flags |= ATA_TFLAG_LBA; -- 1.8.3.1
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