[qemu-xen stable-4.14] libvhost-user: Report descriptor index on panic

[patchbot@xxxxxxx]

commit eca194d43ca4524d0f3552d7b91b15c145649b33
Author:     Philippe Mathieu-Daudé <philmd@xxxxxxxxxx>
AuthorDate: Thu Jul 23 19:19:35 2020 +0200
Commit:     Michael Roth <mdroth@xxxxxxxxxxxxxxxxxx>
CommitDate: Wed Sep 9 18:51:39 2020 -0500

    libvhost-user: Report descriptor index on panic
    
    We want to report the index of the descriptor,
    not its pointer.
    
    Fixes: 7b2e5c65f4 ("contrib: add libvhost-user")
    Signed-off-by: Philippe Mathieu-Daudé <philmd@xxxxxxxxxx>
    Message-Id: <20200723171935.18535-1-philmd@xxxxxxxxxx>
    Reviewed-by: Marc-André Lureau <marcandre.lureau@xxxxxxxxxx>
    Reviewed-by: Raphael Norwitz <raphael.norwitz@xxxxxxxxxxx>
    Reviewed-by: Stefan Hajnoczi <stefanha@xxxxxxxxxx>
    Cc: qemu-stable@xxxxxxxxxx
    Reviewed-by: Michael S. Tsirkin <mst@xxxxxxxxxx>
    Signed-off-by: Michael S. Tsirkin <mst@xxxxxxxxxx>
    (cherry picked from commit 8fe9805c73c277dc2feeaa83de73d6a58bf23f39)
    Signed-off-by: Michael Roth <mdroth@xxxxxxxxxxxxxxxxxx>
---
 contrib/libvhost-user/libvhost-user.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/contrib/libvhost-user/libvhost-user.c 
b/contrib/libvhost-user/libvhost-user.c
index 3bca996c62..301f6d68b3 100644
--- a/contrib/libvhost-user/libvhost-user.c
+++ b/contrib/libvhost-user/libvhost-user.c
@@ -1867,7 +1867,7 @@ virtqueue_get_head(VuDev *dev, VuVirtq *vq,
 
     /* If their number is silly, that's a fatal mistake. */
     if (*head >= vq->vring.num) {
-        vu_panic(dev, "Guest says index %u is available", head);
+        vu_panic(dev, "Guest says index %u is available", *head);
         return false;
     }
 
@@ -1926,7 +1926,7 @@ virtqueue_read_next_desc(VuDev *dev, struct vring_desc 
*desc,
     smp_wmb();
 
     if (*next >= max) {
-        vu_panic(dev, "Desc next is %u", next);
+        vu_panic(dev, "Desc next is %u", *next);
         return VIRTQUEUE_READ_DESC_ERROR;
     }
 
--
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