[libvirt] [PATCH] Fix crash in virsh after bogus command.

[Chris Lalancette]

If you ran virsh in interactive mode and ran a command
that virsh could not parse, it would then SEGV
on subsequent commands.  The problem is that we are
freeing the vshCmd structure in the syntaxError label
at the end of vshCommandParse, but forgetting to
set ctl->cmd to NULL.  This means that on the next command,
we would try to free the same structure again, leading
to badness.  Make sure to set ctl->cmd to NULL after
freeing it.

Signed-off-by: Chris Lalancette <clalance at redhat.com>
---
 tools/virsh.c |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)

diff --git a/tools/virsh.c b/tools/virsh.c
index c6e3f2a..eeaddbc 100644
--- a/tools/virsh.c
+++ b/tools/virsh.c
@@ -8643,8 +8643,10 @@ vshCommandParse(vshControl *ctl, char *cmdstr)
     return TRUE;
 
  syntaxError:
-    if (ctl->cmd)
+    if (ctl->cmd) {
         vshCommandFree(ctl->cmd);
+        ctl->cmd = NULL;
+    }
     if (first)
         vshCommandOptFree(first);
     VIR_FREE(tkdata);
-- 
1.6.6.1