From: Thomas Neumann <tneumann@users.sourceforge.net>
Date: Tue, 2 May 2023 14:21:09 +0000 (+0200)
Subject: release the sorted FDE array when deregistering a frame [PR109685]
X-Git-Tag: releases/gcc-13.2.0~199
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=fd68f60c4ca5d23e4f42c447a2fd1d33030301bf;p=thirdparty%2Fgcc.git

release the sorted FDE array when deregistering a frame [PR109685]

The atomic fastpath bypasses the code that releases the sort
array which was lazily allocated during unwinding. We now
check after deregistering if there is an array to free.

libgcc/ChangeLog:
	PR libgcc/109685
	* unwind-dw2-fde.c: Free sort array in atomic fast path.
---

diff --git a/libgcc/unwind-dw2-fde.c b/libgcc/unwind-dw2-fde.c
index a5786bf729ce..32b9e64a1c88 100644
--- a/libgcc/unwind-dw2-fde.c
+++ b/libgcc/unwind-dw2-fde.c
@@ -241,6 +241,12 @@ __deregister_frame_info_bases (const void *begin)
   // And remove
   ob = btree_remove (&registered_frames, range[0]);
   bool empty_table = (range[1] - range[0]) == 0;
+
+  // Deallocate the sort array if any.
+  if (ob && ob->s.b.sorted)
+    {
+      free (ob->u.sort);
+    }
 #else
   init_object_mutex_once ();
   __gthread_mutex_lock (&object_mutex);