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From 893d4fb45bb0811bcc939054e60e37a47a1786c5 Mon Sep 17 00:00:00 2001
From: Ronald Wahl <ronald.wahl@raritan.com>
Date: Mon, 4 Feb 2013 14:51:46 +0100
Subject: [PATCH] libc: atexit: reuse free slots at the end of exit functions
table
Continuosly dlopen and dlclose of shared object will cause a memory leak
in atexit function. This fix reuse free slots at the end of the list.
For further detail see https://bugs.busybox.net/show_bug.cgi?id=2455
Signed-off-by: Ronald Wahl <ronald.wahl@raritan.com>
Tested-by: Filippo Arcidiacono <filippo.arcidiacono@st.com>
Signed-off-by: Carmelo Amoroso <carmelo.amoroso@st.com>
(cherry picked from commit 389cd96704f21549cafc0b5bdcd0ef762b98bc08)
---
libc/stdlib/_atexit.c | 10 ++++++++++
1 file changed, 10 insertions(+)
diff --git a/libc/stdlib/_atexit.c b/libc/stdlib/_atexit.c
index 48b97ff..0af8c57 100644
--- a/libc/stdlib/_atexit.c
+++ b/libc/stdlib/_atexit.c
@@ -240,6 +240,16 @@ struct exit_function attribute_hidden *__new_exitfn(void)
__UCLIBC_MUTEX_LOCK(__atexit_lock);
+ /*
+ * Reuse free slots at the end of the list.
+ * This avoids eating memory when dlopen and dlclose modules multiple times.
+ */
+ while (__exit_count > 0) {
+ if (__exit_function_table[__exit_count-1].type == ef_free) {
+ --__exit_count;
+ } else break;
+ }
+
#ifdef __UCLIBC_DYNAMIC_ATEXIT__
/* If we are out of function table slots, make some more */
if (__exit_slots < __exit_count+1) {
--
1.7.10.4
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