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core_unreal.c: Fix memory leak in ast_unreal_new_channels()

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When the channel tech is multistream capable, the reference to
chan_topology was passed to the new channel.  When the channel tech
isn't multistream capable, the reference to chan_topology was never
released.  "Local" channels are multistream capable so it didn't
affect them but the confbridge "CBAnn" and the bridge_media
"Recorder" channels are not so they caused a leak every time one
of them was created.

Also added tracing to ast_stream_topology_alloc() and
stream_topology_destroy() to assist with debugging.

Resolves: #938
(cherry picked from commit eecc0469c1)
This commit is contained in:
George Joseph
2024-10-15 11:11:28 -06:00
committed by Asterisk Development Team
parent eecce274d8
commit eb8c55d3e2
2 changed files with 16 additions and 14 deletions
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21
main/core_unreal.c
View File

@@ -1168,7 +1168,7 @@ struct ast_channel *ast_unreal_new_channels(struct ast_unreal_pvt *p,
struct ast_assigned_ids id1 = {NULL, NULL};
struct ast_assigned_ids id2 = {NULL, NULL};
int generated_seqno = ast_atomic_fetchadd_int((int *) &name_sequence, +1);
struct ast_stream_topology *topology;
RAII_VAR(struct ast_stream_topology *, topology, NULL, ast_stream_topology_free);
/* set unique ids for the two channels */
if (assignedids && !ast_strlen_zero(assignedids->uniqueid)) {
@@ -1186,14 +1186,6 @@ struct ast_channel *ast_unreal_new_channels(struct ast_unreal_pvt *p,
id2.uniqueid = uniqueid2;
}
/* We need to create a topology to place on the first channel, as we can't
* share a single one between both.
*/
topology = ast_stream_topology_clone(p->reqtopology);
if (!topology) {
return NULL;
}
/*
* Allocate two new Asterisk channels
*
@@ -1206,7 +1198,6 @@ struct ast_channel *ast_unreal_new_channels(struct ast_unreal_pvt *p,
"%s/%s-%08x;1", tech->type, p->name, (unsigned)generated_seqno);
if (!owner) {
ast_log(LOG_WARNING, "Unable to allocate owner channel structure\n");
ast_stream_topology_free(topology);
return NULL;
}
@@ -1221,7 +1212,15 @@ struct ast_channel *ast_unreal_new_channels(struct ast_unreal_pvt *p,
ast_channel_nativeformats_set(owner, p->reqcap);
if (ast_channel_is_multistream(owner)) {
ast_channel_set_stream_topology(owner, topology);
/*
* We need to create a topology to place on the first channel, as we can't
* share a single one between both.
*/
topology = ast_stream_topology_clone(p->reqtopology);
if (!topology) {
return NULL;
}
ast_channel_set_stream_topology(owner, ao2_bump(topology));
}
/* Determine our read/write format and set it on each channel */

9
main/stream.c
View File

@@ -641,27 +641,30 @@ struct ast_stream *ast_stream_create_resolved(struct ast_stream *pending_stream,
static void stream_topology_destroy(void *data)
{
struct ast_stream_topology *topology = data;
SCOPE_ENTER(4, "Topology: %p: %s\n", topology, ast_str_tmp(128, ast_stream_topology_to_str(topology, &STR_TMP)));
AST_VECTOR_CALLBACK_VOID(&topology->streams, ast_stream_free);
AST_VECTOR_FREE(&topology->streams);
SCOPE_EXIT_RTN("Destroyed: %p\n", topology);
}
#define TOPOLOGY_INITIAL_STREAM_COUNT 2
struct ast_stream_topology *ast_stream_topology_alloc(void)
{
struct ast_stream_topology *topology;
SCOPE_ENTER(4, "Topology Create\n");
topology = ao2_alloc_options(sizeof(*topology), stream_topology_destroy, AO2_ALLOC_OPT_LOCK_NOLOCK);
if (!topology) {
return NULL;
SCOPE_EXIT_RTN_VALUE(NULL, "Allocation failed\n");
}
if (AST_VECTOR_INIT(&topology->streams, TOPOLOGY_INITIAL_STREAM_COUNT)) {
ao2_ref(topology, -1);
topology = NULL;
SCOPE_EXIT_RTN_VALUE(NULL, "Vector init failed\n");
}
return topology;
SCOPE_EXIT_RTN_VALUE(topology, "Created: %p\n", topology);
}
struct ast_stream_topology *ast_stream_topology_clone(