[Xen-changelog] [xen stable-4.1] xenoprof: avoid division by 0

[patchbot@xxxxxxx]

commit c705547372325f22dcc8757d63d6d8494edf53ab
Author:     Tim Deegan <tim@xxxxxxx>
AuthorDate: Fri Feb 22 13:58:04 2013 +0100
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Fri Feb 22 13:58:04 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 ea4ebf1..6d34418 100644
--- a/xen/common/xenoprof.c
+++ b/xen/common/xenoprof.c
@@ -192,6 +192,13 @@ 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 = xmalloc(struct xenoprof);
 
     if ( d->xenoprof == NULL )
@@ -213,10 +220,6 @@ static int alloc_xenoprof_struct(
 
     memset(d->xenoprof->vcpu, 0, d->max_vcpus * sizeof(*d->xenoprof->vcpu));
 
-    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-4.1

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