[glibc] dlfcn: Guard __dlerror_main_freeres with __libc_once_get (once) [BZ# 24476]

[Mark Wielaard <mark at sourceware dot org>]

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=11b451c8868d8a2b0edc5dfd44fc58d9ee538be0

commit 11b451c8868d8a2b0edc5dfd44fc58d9ee538be0
Author: Mark Wielaard <mark@klomp.org>
Date:   Wed May 15 17:14:01 2019 +0200

    dlfcn: Guard __dlerror_main_freeres with __libc_once_get (once) [BZ# 24476]
    
    dlerror.c (__dlerror_main_freeres) will try to free resources which only
    have been initialized when init () has been called. That function is
    called when resources are needed using __libc_once (once, init) where
    once is a __libc_once_define (static, once) in the dlerror.c file.
    Trying to free those resources if init () hasn't been called will
    produce errors under valgrind memcheck. So guard the freeing of those
    resources using __libc_once_get (once) and make sure we have a valid
    key. Also add a similar guard to __dlerror ().
    
    	* dlfcn/dlerror.c (__dlerror_main_freeres): Guard using
    	__libc_once_get (once) and static_bug == NULL.
    	(__dlerror): Check we have a valid key, set result to static_buf
    	otherwise.
    
    Reviewed-by: Carlos O'Donell <carlos@redhat.com>

Diff:
---
 ChangeLog       |  8 ++++++++
 dlfcn/dlerror.c | 29 +++++++++++++++++++++--------
 2 files changed, 29 insertions(+), 8 deletions(-)

diff --git a/ChangeLog b/ChangeLog
index cf6959d..ea7b3d4 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,11 @@
+2019-05-15  Mark Wielaard  <mark@klomp.org>
+
+	[BZ# 24476]
+	* dlfcn/dlerror.c (__dlerror_main_freeres): Guard using
+	__libc_once_get (once) and static_buf == NULL.
+	(__dlerror): Check we have a valid key, set result to static_buf
+	otherwise.
+
 2019-05-15  Andreas Schwab  <schwab@suse.de>
 
 	[BZ #20568]
diff --git a/dlfcn/dlerror.c b/dlfcn/dlerror.c
index 2737658..ca42c12 100644
--- a/dlfcn/dlerror.c
+++ b/dlfcn/dlerror.c
@@ -72,9 +72,16 @@ __dlerror (void)
   __libc_once (once, init);
 
   /* Get error string.  */
-  result = (struct dl_action_result *) __libc_getspecific (key);
-  if (result == NULL)
-    result = &last_result;
+  if (static_buf != NULL)
+    result = static_buf;
+  else
+    {
+      /* init () has been run and we don't use the static buffer.
+	 So we have a valid key.  */
+      result = (struct dl_action_result *) __libc_getspecific (key);
+      if (result == NULL)
+	result = &last_result;
+    }
 
   /* Test whether we already returned the string.  */
   if (result->returned != 0)
@@ -230,13 +237,19 @@ free_key_mem (void *mem)
 void
 __dlerror_main_freeres (void)
 {
-  void *mem;
   /* Free the global memory if used.  */
   check_free (&last_result);
-  /* Free the TSD memory if used.  */
-  mem = __libc_getspecific (key);
-  if (mem != NULL)
-    free_key_mem (mem);
+
+  if (__libc_once_get (once) && static_buf == NULL)
+    {
+      /* init () has been run and we don't use the static buffer.
+	 So we have a valid key.  */
+      void *mem;
+      /* Free the TSD memory if used.  */
+      mem = __libc_getspecific (key);
+      if (mem != NULL)
+	free_key_mem (mem);
+    }
 }
 
 struct dlfcn_hook *_dlfcn_hook __attribute__((nocommon));