[Xen-changelog] [xen-unstable] libxl: fix segfault when detaching non-existant disk

[Xen patchbot-unstable <patchbot-unstable@xxxxxxxxxxxxxxxxxxx>]

# HG changeset patch
# User Gianni Tedesco <gianni.tedesco@xxxxxxxxxx>
# Date 1280244184 -3600
# Node ID 5078f2c1e3d6a3a06ecf352a068eb496f09a2a98
# Parent  92e02df7ef7e6003d005a5ec572e804a5c4114b9
libxl: fix segfault when detaching non-existant disk

Signed-off-by: Gianni Tedesco <gianni.tedesco@xxxxxxxxxx>
Committed-by: Ian Jackson <ian.jackson@xxxxxxxxxxxxx>
---
 tools/libxl/libxl_utils.c |    2 ++
 1 files changed, 2 insertions(+)

diff -r 92e02df7ef7e -r 5078f2c1e3d6 tools/libxl/libxl_utils.c
--- a/tools/libxl/libxl_utils.c Mon Jul 26 11:29:11 2010 +0100
+++ b/tools/libxl/libxl_utils.c Tue Jul 27 16:23:04 2010 +0100
@@ -451,6 +451,8 @@ int libxl_devid_to_device_disk(struct li
     }
 
     val = libxl_xs_read(ctx, XBT_NULL, libxl_sprintf(ctx, "%s/backend-id", 
diskpath));
+    if (!val)
+        return ERROR_FAIL;
     disk->backend_domid = strtoul(val, NULL, 10);
     disk->domid = domid;
     be_path = libxl_xs_read(ctx, XBT_NULL, libxl_sprintf(ctx, "%s/backend", 
diskpath));

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