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authorGreg Edwards <gedwards@ddn.com>2018-08-22 22:21:53 +0300
committerMichael S. Tsirkin <mst@redhat.com>2018-10-25 04:16:13 +0300
commit4542d623c7134bc1738f8a68ccb6dd546f1c264f (patch)
tree158c20e9dc8043d6f6d56f01ce6e504b176a7ff6 /drivers/vhost
parent2e991629bcf55a43681aec1ee096eeb03cf81709 (diff)
downloadlinux-4542d623c7134bc1738f8a68ccb6dd546f1c264f.tar.xz
vhost/scsi: truncate T10 PI iov_iter to prot_bytes
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@ddn.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Fixes: 09b13fa8c1a1093e9458549ac8bb203a7c65c62a Cc: stable@vger.kernel.org Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'drivers/vhost')
-rw-r--r--drivers/vhost/scsi.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/drivers/vhost/scsi.c b/drivers/vhost/scsi.c
index c24bb690680b..e7e3ae13516d 100644
--- a/drivers/vhost/scsi.c
+++ b/drivers/vhost/scsi.c
@@ -964,7 +964,8 @@ vhost_scsi_handle_vq(struct vhost_scsi *vs, struct vhost_virtqueue *vq)
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
@@ -973,6 +974,7 @@ vhost_scsi_handle_vq(struct vhost_scsi *vs, struct vhost_virtqueue *vq)
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);