Don't dereference or free undefined "msg" upon OOM.

* src/guestfs.c (guestfs_error): Handle failing vasprintf.

diff --git a/src/guestfs.c b/src/guestfs.c
index 5743a07..87b0d86 100644 (file)
--- a/src/guestfs.c
+++ b/src/guestfs.c
@@ -404,9 +404,11 @@ guestfs_error (guestfs_h *g, const char *fs, ...)
   char *msg;
 
   va_start (args, fs);
-  vasprintf (&msg, fs, args);
+  int err = vasprintf (&msg, fs, args);
   va_end (args);
 
+  if (err < 0) return;
+
   if (g->error_cb) g->error_cb (g, g->error_cb_data, msg);
   set_last_error (g, msg);