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

[Thomas Neumann via Gcc-patches]

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:
        * unwind-dw2-fde.c: Free sort array in atomic fast path.
---
 libgcc/unwind-dw2-fde.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/libgcc/unwind-dw2-fde.c b/libgcc/unwind-dw2-fde.c
index 7b74c391ced..4d2737ff9f7 100644
--- a/libgcc/unwind-dw2-fde.c
+++ b/libgcc/unwind-dw2-fde.c
@@ -240,6 +240,12 @@ __deregister_frame_info_bases (const void *begin)

   // And remove
   ob = btree_remove (&registered_frames, range[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);
--
2.39.2