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# DP: Proposed patch for PR mudflap/24619 (instrumentation of dlopen)

Index: b/src/libmudflap/mf-hooks2.c
===================================================================
--- a/src/libmudflap/mf-hooks2.c
+++ b/src/libmudflap/mf-hooks2.c
@@ -1677,8 +1677,10 @@
   size_t n;
   TRACE ("%s\n", __PRETTY_FUNCTION__);
   n = strlen (path);
-  MF_VALIDATE_EXTENT (path, CLAMPADD(n, 1), __MF_CHECK_READ, "dlopen path");
-  p = dlopen (path, flags);
+  if (NULL != path) {
+    MF_VALIDATE_EXTENT (path, CLAMPADD(n, 1), __MF_CHECK_READ, "dlopen path");
+    p = dlopen (path, flags);
+  }
   if (NULL != p) {
 #ifdef MF_REGISTER_dlopen
     __mf_register (p, 0, MF_REGISTER_dlopen, "dlopen result");