[Xen-changelog] [xen stable-4.2] xenoprof: avoid division by 0

[patchbot@xxxxxxx]

commit 9b6884e385b61c9c603b4deafeda297ec7b63ca6
Author:     Tim Deegan <tim@xxxxxxx>
AuthorDate: Fri Feb 22 13:44:53 2013 +0100
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Fri Feb 22 13:44:53 2013 +0100

    xenoprof: avoid division by 0
    
    Signed-off-by: Tim Deegan <tim@xxxxxxx>
    Acked-by: Jan Beulich <jbeulich@xxxxxxxx>
    Acked-by: Keir Fraser <keir@xxxxxxx>
    master changeset: 085f1f2d3aee1a35dfc7ca2f4423e51fa654010c
    master date: 2013-02-15 09:42:02 +0100
---
 xen/common/xenoprof.c |   11 +++++++----
 1 files changed, 7 insertions(+), 4 deletions(-)

diff --git a/xen/common/xenoprof.c b/xen/common/xenoprof.c
index 44a1fae..8709440 100644
--- a/xen/common/xenoprof.c
+++ b/xen/common/xenoprof.c
@@ -193,6 +193,13 @@ static int alloc_xenoprof_struct(
     unsigned max_max_samples;
     int i;
 
+    nvcpu = 0;
+    for_each_vcpu ( d, v )
+        nvcpu++;
+
+    if ( !nvcpu )
+        return -EINVAL;
+
     d->xenoprof = xzalloc(struct xenoprof);
     if ( d->xenoprof == NULL )
     {
@@ -209,10 +216,6 @@ static int alloc_xenoprof_struct(
         return -ENOMEM;
     }
 
-    nvcpu = 0;
-    for_each_vcpu ( d, v )
-        nvcpu++;
-
     bufsize = sizeof(struct xenoprof_buf);
     i = sizeof(struct event_log);
 #ifdef CONFIG_COMPAT
--
generated by git-patchbot for /home/xen/git/xen.git#stable-4.2

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