Set NODELETE flag after checking for NULL pointer

The commit b632bdd3 moved the setting of the DF_1_NODELETE flag earlier
in the dl_open_worker function. However when calling dlopen with both
RTLD_NODELETE and RTLD_NOLOAD, the pointer returned by _dl_map_object is
NULL. This condition is checked just after setting the flag, while it
should be done before. Fix that.

Changelog:
	[BZ #19810]
	* elf/dl-open.c (dl_open_worker): Set DF_1_NODELETE flag later.
	* elf/tst-noload.c: New test case.
	* elf/Makefile (tests): Add tst-noload.

1 files changed, 6 insertions, 6 deletions

diff --git a/elf/dl-open.c b/elf/dl-open.c
index 6f178b333d..3e5df4891e 100644
--- a/elf/dl-open.c
+++ b/elf/dl-open.c
@@ -226,12 +226,6 @@ dl_open_worker (void *a)
   args->map = new = _dl_map_object (call_map, file, lt_loaded, 0,
 				    mode | __RTLD_CALLMAP, args->nsid);
 
-  /* Mark the object as not deletable if the RTLD_NODELETE flags was passed.
-     Do this early so that we don't skip marking the object if it was
-     already loaded.  */
-  if (__glibc_unlikely (mode & RTLD_NODELETE))
-    new->l_flags_1 |= DF_1_NODELETE;
-
   /* If the pointer returned is NULL this means the RTLD_NOLOAD flag is
      set and the object is not already loaded.  */
   if (new == NULL)
@@ -240,6 +234,12 @@ dl_open_worker (void *a)
       return;
     }
 
+  /* Mark the object as not deletable if the RTLD_NODELETE flags was passed.
+     Do this early so that we don't skip marking the object if it was
+     already loaded.  */
+  if (__glibc_unlikely (mode & RTLD_NODELETE))
+    new->l_flags_1 |= DF_1_NODELETE;
+
   if (__glibc_unlikely (mode & __RTLD_SPROF))
     /* This happens only if we load a DSO for 'sprof'.  */
     return;