[Xen-changelog] [xen stable-4.4] libxl: Do not trust frontend for nic in libxl_devid_to_device_nic

[patchbot@xxxxxxx]

commit 04e831a92bddeccbbeb2bded9d30486cfe98c02d
Author:     Ian Jackson <ian.jackson@xxxxxxxxxxxxx>
AuthorDate: Tue May 3 15:52:53 2016 +0100
Commit:     Ian Jackson <Ian.Jackson@xxxxxxxxxxxxx>
CommitDate: Mon Jun 6 15:54:27 2016 +0100

    libxl: Do not trust frontend for nic in libxl_devid_to_device_nic
    
    Find the backend by reading the pointer in /libxl rather than in the
    guest's frontend area.
    
    This is part of XSA-175.
    
    Signed-off-by: Ian Jackson <Ian.Jackson@xxxxxxxxxxxxx>
    Reviewed-by: Wei Liu <wei.liu2@xxxxxxxxxx>
---
 tools/libxl/libxl.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/tools/libxl/libxl.c b/tools/libxl/libxl.c
index a0aeb50..7a8faba 100644
--- a/tools/libxl/libxl.c
+++ b/tools/libxl/libxl.c
@@ -3066,17 +3066,17 @@ int libxl_devid_to_device_nic(libxl_ctx *ctx, uint32_t 
domid,
                               int devid, libxl_device_nic *nic)
 {
     GC_INIT(ctx);
-    char *dompath, *path;
+    char *libxl_dom_path, *path;
     int rc = ERROR_FAIL;
 
     libxl_device_nic_init(nic);
-    dompath = libxl__xs_get_dompath(gc, domid);
-    if (!dompath)
+    libxl_dom_path = libxl__xs_libxl_path(gc, domid);
+    if (!libxl_dom_path)
         goto out;
 
     path = libxl__xs_read(gc, XBT_NULL,
-                          libxl__sprintf(gc, "%s/device/vif/%d/backend",
-                                         dompath, devid));
+                          GCSPRINTF("%s/device/vif/%d/backend", libxl_dom_path,
+                                    devid));
     if (!path)
         goto out;
 
--
generated by git-patchbot for /home/xen/git/xen.git#stable-4.4

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