PR15044: ucontext.stp: fix name == NULL bug on error

The 'name' variable was not assigned a value if _stp_umod_lookup()
failed. This means the call to strlcpy() happened even though 'name'
was NULL. Now, name is always assigned a value, even if
_stp_umod_lookup() fails.

diff --git a/tapset/linux/ucontext.stp b/tapset/linux/ucontext.stp
index b2b045ee505512618780b7f5e2d92cf0957669e1..ba9c7d7970326cdfd906667f651c500160cd6b10 100644 (file)
--- a/tapset/linux/ucontext.stp
+++ b/tapset/linux/ucontext.stp
@@ -19,9 +19,8 @@ function umodname:string (addr:long) %{
   const char *name = NULL;
   _stp_umod_lookup(STAP_ARG_addr, current, &name, NULL, NULL);
   if (!name) {
-#if STAP_COMPAT_VERSION < STAP_VERSION(2,3) // PR15044
     name = "<unknown>";
-#else
+#if STAP_COMPAT_VERSION >= STAP_VERSION(2,3) // PR15044
     CONTEXT->last_error = "module cannot be found";
 #endif
   }