commit d1d00465cd115b5d9bdb95aa8525f5bd65633f64
Author: Dmitry Lenev <dmitry.lenev@percona.com>
Date:   Tue Jun 2 13:45:24 2026 +0200

    Bug #120602     Memory leak in fil_ibd_same_as_default_path()
    
    ASAN reported memory leak in fil_ibd_same_as_default_path() in several
    tests. This unsophisticated memory leak was introduced in MySQL 8.0.46 by
    fix for "Bug#38169053: MySQL 8.0.39/40 crashed due to Assertion failure
    error when running TRUNCATE"
    (https://github.com/mysql/mysql-server/commit/b63930df6330cfbf81ea9d8e4c9eace3e16c3703).
    The problem was that default_path string was allocated but not properly
    freed on all return paths from this function.
    
    Ensure that default_path string is freed in all cases by using RAII helper.

diff --git a/storage/innobase/fil/fil0fil.cc b/storage/innobase/fil/fil0fil.cc
index b4c323c3220..14958e7d4c5 100644
--- a/storage/innobase/fil/fil0fil.cc
+++ b/storage/innobase/fil/fil0fil.cc
@@ -9884,6 +9884,8 @@ static bool fil_ibd_same_as_default_path(const char *space_name,
   /* Build the implicit default path for this table name under @@datadir. */
   char *default_path = Fil_path::make("", space_name, IBD);
 
+  auto guard = create_scope_guard([&]() { ut::free(default_path); });
+
   if (default_path == nullptr || default_path[0] == '\0') {
     return false;
   }
@@ -9907,7 +9909,6 @@ static bool fil_ibd_same_as_default_path(const char *space_name,
 
   df_found.close();
   df_default.close();
-  ut::free(default_path);
 
   return same;
 }