4.9-stable review patch. If anyone has any objections, please let me know.
------------------
From: Greg Edwards <gedwards@xxxxxxx>
commit 4542d623c7134bc1738f8a68ccb6dd546f1c264f upstream.
Commands with protection information included were not truncating the
protection iov_iter to the number of protection bytes in the command.
This resulted in vhost_scsi mis-calculating the size of the protection
SGL in vhost_scsi_calc_sgls(), and including both the protection and
data SG entries in the protection SGL.
Fixes: 09b13fa8c1a1 ("vhost/scsi: Add ANY_LAYOUT support in vhost_scsi_handle_vq")
Signed-off-by: Greg Edwards <gedwards@xxxxxxx>
Signed-off-by: Michael S. Tsirkin <mst@xxxxxxxxxx>
Fixes: 09b13fa8c1a1093e9458549ac8bb203a7c65c62a
Cc: stable@xxxxxxxxxxxxxxx
Reviewed-by: Paolo Bonzini <pbonzini@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/vhost/scsi.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
--- a/drivers/vhost/scsi.c
+++ b/drivers/vhost/scsi.c
@@ -999,7 +999,8 @@ vhost_scsi_handle_vq(struct vhost_scsi *
prot_bytes = vhost32_to_cpu(vq, v_req_pi.pi_bytesin);
}
/*
- * Set prot_iter to data_iter, and advance past any
+ * Set prot_iter to data_iter and truncate it to
+ * prot_bytes, and advance data_iter past any
* preceeding prot_bytes that may be present.
*
* Also fix up the exp_data_len to reflect only the
@@ -1008,6 +1009,7 @@ vhost_scsi_handle_vq(struct vhost_scsi *
if (prot_bytes) {
exp_data_len -= prot_bytes;
prot_iter = data_iter;
+ iov_iter_truncate(&prot_iter, prot_bytes);
iov_iter_advance(&data_iter, prot_bytes);
}
tag = vhost64_to_cpu(vq, v_req_pi.tag);
