[libvirt] [PATCH] virsh: Avoid division by 0 in vshCalloc

[Peter Krempa]

vshCalloc function uses xalloc_oversized macro that can't take 0 as it's
second argument. If vshCalloc is called with size 0, virsh ends with a
floating point exception.

This patch changes vshCalloc to return NULL if no memory is requested.
---
 tools/virsh.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)

diff --git a/tools/virsh.c b/tools/virsh.c
index 53d1825..d3d5c6a 100644
--- a/tools/virsh.c
+++ b/tools/virsh.c
@@ -460,6 +460,9 @@ _vshCalloc(vshControl *ctl, size_t nmemb, size_t size, const char *filename, int
 {
     char *x;

+    if (!size)
+        return NULL;
+
     if (!xalloc_oversized(nmemb, size) &&
         VIR_ALLOC_N(x, nmemb * size) == 0)
         return x;
-- 
1.7.8.6