[ovs-dev] [PATCH 1/1] test-ovn: fix memory leak

[Damijan Skvarc]

Many memory leaks were detected by valgrind while running 
"3-term numeric expression simplification" unit test. All of them
are reported in a form similar to:

==25922== 57,071,464 bytes in 192,809 blocks are definitely lost in loss record 70 of 70
==25922==    at 0x4C2DB8F: malloc (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==25922==    by 0x468604: xmalloc (util.c:138)
==25922==    by 0x5354B1: expr_create_boolean (expr.c:222)
==25922==    by 0x5354B1: expr_fix_andor (expr.c:268)
==25922==    by 0x536F0F: expr_simplify (expr.c:2108)
==25922==    by 0x409C73: test_tree_shape_exhaustively (test-ovn.c:914)
==25922==    by 0x40A83E: test_exhaustive (test-ovn.c:1140)
==25922==    by 0x4110D3: ovs_cmdl_run_command__ (command-line.c:247)
==25922==    by 0x407B01: test_ovn_main (test-ovn.c:1623)
==25922==    by 0x407B01: ovstest_wrapper_test_ovn_main__ (test-ovn.c:1626)
==25922==    by 0x4110D3: ovs_cmdl_run_command__ (command-line.c:247)
==25922==    by 0x4066B9: main (ovstest.c:133)


The problem was in test_tree_shape_exhaustively() function which 
overides pointer to temporary allocated expression without freeing it first.

Signed-off-by: Damijan Skvarc <damjan.skvarc at gmail.com>

---
 tests/test-ovn.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tests/test-ovn.c b/tests/test-ovn.c
index 8ef886d..c607a8f 100644
--- a/tests/test-ovn.c
+++ b/tests/test-ovn.c
@@ -913,7 +913,7 @@ test_tree_shape_exhaustively(struct expr *expr, struct shash *symtab,
         } else if (operation >= OP_SIMPLIFY) {
             modified = expr_simplify(expr_clone(expr));
             modified = expr_evaluate_condition(
-                expr_clone(modified), tree_shape_is_chassis_resident_cb, NULL);
+                modified, tree_shape_is_chassis_resident_cb, NULL);
             ovs_assert(expr_honors_invariants(modified));
 
             if (operation >= OP_NORMALIZE) {
-- 
2.7.4