* [PATCH RESEND] libata: if T_LENGTH is zero, dma direction should be DMA_NONE
@ 2021-12-13 15:09 George Kennedy
2021-12-13 15:19 ` Greg KH
0 siblings, 1 reply; 2+ messages in thread
From: George Kennedy @ 2021-12-13 15:09 UTC (permalink / raw)
To: damien.lemoal; +Cc: george.kennedy, linux-ide, linux-kernel, stable
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.
Reported-by: syzkaller <syzkaller@googlegroups.com>
Signed-off-by: George Kennedy <george.kennedy@oracle.com>
---
drivers/ata/libata-scsi.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/drivers/ata/libata-scsi.c b/drivers/ata/libata-scsi.c
index 1b84d55..d428392 100644
--- a/drivers/ata/libata-scsi.c
+++ b/drivers/ata/libata-scsi.c
@@ -2859,6 +2859,12 @@ static unsigned int ata_scsi_pass_thru(struct ata_queued_cmd *qc)
goto invalid_fld;
}
+ /* if T_LENGTH is zero (No data is transferred), then dir should be DMA_NONE */
+ if ((cdb[2 + cdb_offset] & 3) == 0 && scmd->sc_data_direction != DMA_NONE) {
+ fp = 2 + cdb_offset;
+ goto invalid_fld;
+ }
+
if (ata_is_ncq(tf->protocol) && (cdb[2 + cdb_offset] & 0x3) == 0)
tf->protocol = ATA_PROT_NCQ_NODATA;
--
1.8.3.1
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH RESEND] libata: if T_LENGTH is zero, dma direction should be DMA_NONE
2021-12-13 15:09 [PATCH RESEND] libata: if T_LENGTH is zero, dma direction should be DMA_NONE George Kennedy
@ 2021-12-13 15:19 ` Greg KH
0 siblings, 0 replies; 2+ messages in thread
From: Greg KH @ 2021-12-13 15:19 UTC (permalink / raw)
To: George Kennedy; +Cc: damien.lemoal, linux-ide, linux-kernel, stable
On Mon, Dec 13, 2021 at 10:09:24AM -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.
>
> Reported-by: syzkaller <syzkaller@googlegroups.com>
> Signed-off-by: George Kennedy <george.kennedy@oracle.com>
> ---
> drivers/ata/libata-scsi.c | 6 ++++++
> 1 file changed, 6 insertions(+)
<formletter>
This is not the correct way to submit patches for inclusion in the
stable kernel tree. Please read:
https://www.kernel.org/doc/html/latest/process/stable-kernel-rules.html
for how to do this properly.
</formletter>
^ permalink raw reply [flat|nested] 2+ messages in thread
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