[libvirt] [PATCH 01/23] Fix crash on OOM in xenParseSxpr

[Daniel P. Berrange]

From: "Daniel P. Berrange" <berrange at redhat.com>

The xenParseSxpr method sets def->nconsoles to 1 before allocating
the def->consoles array. If the allocation fails due to OOM the
cleanup code will thus crash accessing out of bounds.

Signed-off-by: Daniel P. Berrange <berrange at redhat.com>
---
 src/xenxs/xen_sxpr.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/xenxs/xen_sxpr.c b/src/xenxs/xen_sxpr.c
index 6209c68..462eac6 100644
--- a/src/xenxs/xen_sxpr.c
+++ b/src/xenxs/xen_sxpr.c
@@ -1439,9 +1439,9 @@ xenParseSxpr(const struct sexpr *root,
             def->parallels[def->nparallels++] = chr;
         }
     } else if (def->id != 0) {
-        def->nconsoles = 1;
         if (VIR_ALLOC_N(def->consoles, 1) < 0)
             goto error;
+        def->nconsoles = 1;
         /* Fake a paravirt console, since that's not in the sexpr */
         if (!(def->consoles[0] = xenParseSxprChar("pty", tty)))
             goto error;
-- 
1.8.3.1