9e30c5c2b1
Signed-off-by: Vicente Olivert Riera <Vincent.Riera@imgtec.com> Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
44 lines
1.4 KiB
Diff
44 lines
1.4 KiB
Diff
From 893d4fb45bb0811bcc939054e60e37a47a1786c5 Mon Sep 17 00:00:00 2001
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From: Ronald Wahl <ronald.wahl@raritan.com>
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Date: Mon, 4 Feb 2013 14:51:46 +0100
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Subject: [PATCH] libc: atexit: reuse free slots at the end of exit functions
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table
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Continuosly dlopen and dlclose of shared object will cause a memory leak
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in atexit function. This fix reuse free slots at the end of the list.
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For further detail see https://bugs.busybox.net/show_bug.cgi?id=2455
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Signed-off-by: Ronald Wahl <ronald.wahl@raritan.com>
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Tested-by: Filippo Arcidiacono <filippo.arcidiacono@st.com>
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Signed-off-by: Carmelo Amoroso <carmelo.amoroso@st.com>
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(cherry picked from commit 389cd96704f21549cafc0b5bdcd0ef762b98bc08)
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---
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libc/stdlib/_atexit.c | 10 ++++++++++
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1 file changed, 10 insertions(+)
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diff --git a/libc/stdlib/_atexit.c b/libc/stdlib/_atexit.c
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index 48b97ff..0af8c57 100644
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--- a/libc/stdlib/_atexit.c
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+++ b/libc/stdlib/_atexit.c
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@@ -240,6 +240,16 @@ struct exit_function attribute_hidden *__new_exitfn(void)
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__UCLIBC_MUTEX_LOCK(__atexit_lock);
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+ /*
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+ * Reuse free slots at the end of the list.
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+ * This avoids eating memory when dlopen and dlclose modules multiple times.
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+ */
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+ while (__exit_count > 0) {
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+ if (__exit_function_table[__exit_count-1].type == ef_free) {
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+ --__exit_count;
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+ } else break;
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+ }
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+
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#ifdef __UCLIBC_DYNAMIC_ATEXIT__
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/* If we are out of function table slots, make some more */
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if (__exit_slots < __exit_count+1) {
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--
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1.7.10.4
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