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From 2a09e2b15e7493256de4f40331ce6be4e1fe90f4 Mon Sep 17 00:00:00 2001
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From: Bastien Nocera <hadess@hadess.net>
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Date: Thu, 3 Dec 2015 18:28:46 +0100
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Subject: [PATCH] Fix possible use-after-free on exit
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When the last client of dleyna-server exits, and dleyna-server
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tries to exit, it might use the "upnp" pointer after it was freed as we
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receive a signal where the user_data is invalid. Avoid that by zero'ing
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freed pointers and disconnecting from the signal for which "upnp" is
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user_data.
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See https://retrace.fedoraproject.org/faf/reports/855440/
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---
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libdleyna/server/server.c | 5 ++++-
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libdleyna/server/upnp.c | 3 +++
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2 files changed, 7 insertions(+), 1 deletion(-)
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diff --git a/libdleyna/server/server.c b/libdleyna/server/server.c
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index ec725de3f6b3..865336162d61 100644
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--- a/libdleyna/server/server.c
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+++ b/libdleyna/server/server.c
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@@ -1352,12 +1352,15 @@ static void prv_control_point_stop_service(void)
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{
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uint i;
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- if (g_context.manager)
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+ if (g_context.manager) {
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dls_manager_delete(g_context.manager);
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+ g_context.manager = NULL;
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+ }
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if (g_context.upnp) {
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dls_upnp_unsubscribe(g_context.upnp);
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dls_upnp_delete(g_context.upnp);
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+ g_context.upnp = NULL;
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}
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if (g_context.connection) {
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diff --git a/libdleyna/server/upnp.c b/libdleyna/server/upnp.c
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index 6d6c696dd42c..dcf31d98f171 100755
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--- a/libdleyna/server/upnp.c
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+++ b/libdleyna/server/upnp.c
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@@ -547,6 +547,9 @@ dls_upnp_t *dls_upnp_new(dleyna_connector_id_t connection,
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void dls_upnp_delete(dls_upnp_t *upnp)
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{
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if (upnp) {
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+ g_signal_handlers_disconnect_by_func (G_OBJECT (upnp->context_manager),
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+ G_CALLBACK(prv_on_context_available),
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+ upnp);
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g_object_unref(upnp->context_manager);
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g_hash_table_unref(upnp->property_map);
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g_hash_table_unref(upnp->filter_map);
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--
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2.5.5
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