[Xen-changelog] [xen stable-4.4] libxl: Do not trust backend for disk in getinfo

[patchbot@xxxxxxx]

commit 2dbe3631693ac13c74d31c6e30c12447d4c62854
Author:     Ian Jackson <ian.jackson@xxxxxxxxxxxxx>
AuthorDate: Fri Apr 29 19:10:45 2016 +0100
Commit:     Ian Jackson <Ian.Jackson@xxxxxxxxxxxxx>
CommitDate: Mon Jun 6 16:14:00 2016 +0100

    libxl: Do not trust backend for disk in getinfo
    
    Do not read the frontend path out of the backend.  We have it in our
    hand.  Likewise the guest (frontend) domid was one of our parameters (!)
    
    This is part of XSA-178.
    
    Signed-off-by: Ian Jackson <Ian.Jackson@xxxxxxxxxxxxx>
    Reviewed-by: Wei Liu <wei.liu2@xxxxxxxxxx>
---
 tools/libxl/libxl.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/tools/libxl/libxl.c b/tools/libxl/libxl.c
index cab98e0..01d41b1 100644
--- a/tools/libxl/libxl.c
+++ b/tools/libxl/libxl.c
@@ -2480,9 +2480,8 @@ int libxl_device_disk_getinfo(libxl_ctx *ctx, uint32_t 
domid,
     val = libxl__xs_read(gc, XBT_NULL, GCSPRINTF("%s/ring-ref", fe_path));
     diskinfo->rref = val ? strtoul(val, NULL, 10) : -1;
     diskinfo->frontend = xs_read(ctx->xsh, XBT_NULL,
-                                 libxl__sprintf(gc, "%s/frontend", 
diskinfo->backend), NULL);
-    val = libxl__xs_read(gc, XBT_NULL, libxl__sprintf(gc, "%s/frontend-id", 
diskinfo->backend));
-    diskinfo->frontend_id = val ? strtoul(val, NULL, 10) : -1;
+                                 GCSPRINTF("%s/frontend", libxl_path), NULL);
+    diskinfo->frontend_id = domid;
 
     GC_FREE;
     return 0;
--
generated by git-patchbot for /home/xen/git/xen.git#stable-4.4

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